diff --git a/Pipfile b/Pipfile
index 079582c..17c70e4 100644
--- a/Pipfile
+++ b/Pipfile
@@ -11,6 +11,7 @@ pytest = "*"
 "flake8" = "*"
 black = "*"
 twine = "*"
+flask = "*"
 
 [requires]
 python_version = "3.7"
diff --git a/Pipfile.lock b/Pipfile.lock
index 565e0d3..2350f30 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "13d6d0b2229e162611f4355a6887db0719a0c47471facb391b524635567d6884"
+            "sha256": "5843d79d019341544a1c9456b537125203079f127721132c8111421095660524"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -117,7 +117,6 @@
                 "sha256:a68ac5e15e76e7e5dd2b8f94007233e01effe3e50e8daddf69acfd81cb686baf",
                 "sha256:b5725a0bd4ba422ab0e66e89e030c806576753ea3ee08554382c14e685d117b5"
             ],
-            "markers": "python_version < '4' and python_version != '3.3.*' and python_version != '3.2.*' and python_version != '3.0.*' and python_version != '3.1.*' and python_version >= '2.6'",
             "version": "==1.23"
         },
         "waitress": {
@@ -155,7 +154,6 @@
                 "sha256:0312ad34fcad8fac3704d441f7b317e50af620823353ec657a53e981f92920c0",
                 "sha256:ec9ae8adaae229e4f8446952d204a3e4b5fdd2d099f9be3aaf556120135fb3ee"
             ],
-            "markers": "python_version != '3.2.*' and python_version >= '2.7' and python_version != '3.3.*' and python_version != '3.0.*' and python_version != '3.1.*'",
             "version": "==1.2.1"
         },
         "attrs": {
@@ -175,10 +173,10 @@
         },
         "bleach": {
             "hashes": [
-                "sha256:9c471c0dd9c820f6bf4ee5ca3e348ceccefbc1475d9a40c397ed5d04e0b42c54",
-                "sha256:b407b2612b37e6cdc6704f84cec18c1f140b78e6c625652a844e89d6b9855f6b"
+                "sha256:c39d25d9ada62009853b0281efdc35a792db8cdee89465433e6d0aaaf5defc3f",
+                "sha256:f680cc08e2eea821f3173b875f68763960006f1e764c92b5d2b8354af3a47468"
             ],
-            "version": "==3.0.0"
+            "version": "==3.0.1"
         },
         "certifi": {
             "hashes": [
@@ -236,7 +234,6 @@
                 "sha256:2335065e6395b9e67ca716de5f7526736bfa6ceead690adf616d925bdc622b13",
                 "sha256:5b94b49521f6456670fdb30cd82a4eca9412788a93fa6dd6df72c94d5a8ff2d7"
             ],
-            "markers": "python_version != '3.3.*' and python_version != '3.0.*' and python_version != '3.2.*' and python_version != '3.1.*' and python_version >= '2.7'",
             "version": "==7.0"
         },
         "cmarkgfm": {
@@ -270,7 +267,6 @@
                 "sha256:e8932bddf159064f04e946fbb64693753488de21586f20e840b3be51745c8c09",
                 "sha256:f20900f16377f2109783ae9348d34bc80530808439591c3d3df73d5c7ef1a00c"
             ],
-            "markers": "python_version != '3.2.*' and python_version >= '2.7' and python_version != '3.3.*' and python_version != '3.0.*' and python_version != '3.1.*'",
             "version": "==0.4.2"
         },
         "colorama": {
@@ -297,6 +293,14 @@
             "index": "pypi",
             "version": "==3.5.0"
         },
+        "flask": {
+            "hashes": [
+                "sha256:2271c0070dbcb5275fad4a82e29f23ab92682dc45f9dfbc22c02ba9b9322ce48",
+                "sha256:a080b744b7e345ccfcbc77954861cb05b3c63786e93f2b3875e0913d44b43f05"
+            ],
+            "index": "pypi",
+            "version": "==1.0.2"
+        },
         "future": {
             "hashes": [
                 "sha256:e39ced1ab767b5936646cedba8bcce582398233d6a627067d4c6a454c90cfedb"
@@ -310,6 +314,25 @@
             ],
             "version": "==2.7"
         },
+        "itsdangerous": {
+            "hashes": [
+                "sha256:cbb3fcf8d3e33df861709ecaf89d9e6629cff0a217bc2848f1b41cd30d360519"
+            ],
+            "version": "==0.24"
+        },
+        "jinja2": {
+            "hashes": [
+                "sha256:74c935a1b8bb9a3947c50a54766a969d4846290e1e788ea44c1392163723c3bd",
+                "sha256:f84be1bb0040caca4cea721fcbbbbd61f9be9464ca236387158b0feea01914a4"
+            ],
+            "version": "==2.10"
+        },
+        "markupsafe": {
+            "hashes": [
+                "sha256:a6be69091dac236ea9c6bc7d012beab42010fa914c459791d627dad4910eb665"
+            ],
+            "version": "==1.0"
+        },
         "mccabe": {
             "hashes": [
                 "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42",
@@ -337,7 +360,6 @@
                 "sha256:6e3836e39f4d36ae72840833db137f7b7d35105079aee6ec4a62d9f80d594dd1",
                 "sha256:95eb8364a4708392bae89035f45341871286a333f749c3141c20573d2b3876e1"
             ],
-            "markers": "python_version != '3.2.*' and python_version >= '2.7' and python_version != '3.3.*' and python_version != '3.0.*' and python_version != '3.1.*'",
             "version": "==0.7.1"
         },
         "py": {
@@ -345,7 +367,6 @@
                 "sha256:06a30435d058473046be836d3fc4f27167fd84c45b99704f2fb5509ef61f9af1",
                 "sha256:50402e9d1c9005d759426988a492e0edaadb7f4e68bcddfea586bc7432d009c6"
             ],
-            "markers": "python_version != '3.2.*' and python_version >= '2.7' and python_version != '3.3.*' and python_version != '3.0.*' and python_version != '3.1.*'",
             "version": "==1.6.0"
         },
         "pycodestyle": {
@@ -359,7 +380,6 @@
             "hashes": [
                 "sha256:a988718abfad80b6b157acce7bf130a30876d27603738ac39f140993246b25b3"
             ],
-            "markers": "python_version != '3.2.*' and python_version != '3.1.*' and python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.3.*'",
             "version": "==2.19"
         },
         "pyflakes": {
@@ -389,7 +409,6 @@
                 "sha256:237ca8705ffea849870de41101dba41543561da05c0ae45b2f1c547efa9843d2",
                 "sha256:f75049a3a7afa57165551e030dd8f9882ebf688b9600535a3f7e23596651875d"
             ],
-            "markers": "python_version != '3.2.*' and python_version >= '2.7' and python_version != '3.3.*' and python_version != '3.0.*' and python_version != '3.1.*'",
             "version": "==22.0"
         },
         "requests": {
@@ -425,7 +444,6 @@
                 "sha256:18f1818ce951aeb9ea162ae1098b43f583f7d057b34d706f66939353d1208889",
                 "sha256:df02c0650160986bac0218bb07952245fc6960d23654648b5d5526ad5a4128c9"
             ],
-            "markers": "python_version >= '2.6' and python_version != '3.0.*' and python_version != '3.1.*'",
             "version": "==4.26.0"
         },
         "twine": {
@@ -441,7 +459,6 @@
                 "sha256:a68ac5e15e76e7e5dd2b8f94007233e01effe3e50e8daddf69acfd81cb686baf",
                 "sha256:b5725a0bd4ba422ab0e66e89e030c806576753ea3ee08554382c14e685d117b5"
             ],
-            "markers": "python_version < '4' and python_version != '3.3.*' and python_version != '3.2.*' and python_version != '3.0.*' and python_version != '3.1.*' and python_version >= '2.6'",
             "version": "==1.23"
         },
         "webencodings": {
@@ -450,6 +467,13 @@
                 "sha256:b36a1c245f2d304965eb4e0a82848379241dc04b865afcc4aab16748587e1923"
             ],
             "version": "==0.5.1"
+        },
+        "werkzeug": {
+            "hashes": [
+                "sha256:c3fd7a7d41976d9f44db327260e263132466836cef6f91512889ed60ad26557c",
+                "sha256:d5da73735293558eb1651ee2fddc4d0dedcfa06538b8813a2e20011583c9e49b"
+            ],
+            "version": "==0.14.1"
         }
     }
 }
diff --git a/README.md b/README.md
index 9351922..3eea327 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,7 @@ The primary concept here is to bring the nicities that are brought forth from bo
 ## New Ideas
 
 - **A built in testing client that uses the actual Requests you know and love**.
+- The ability to mount other WSGI apps easily.
 - Automatic gzipped-responses (still working on that).
 - In addition to Falcon's `on_get`, `on_post`, etc methods, Responder features an `on_request` method, which gets called on every type of request, much like Requests.
 - WhiteNoise is built-in, for serving static files (this has yet to be built out, there's no templating or `static_url` yet)
diff --git a/app.py b/app.py
index 66c6f94..e4db9c8 100644
--- a/app.py
+++ b/app.py
@@ -1,8 +1,19 @@
 import responder
 import graphene
 
+
+from flask import Flask
+
+app = Flask(__name__)
+
+
+@app.route("/")
+def hello_world():
+    return "Hello, World from flask!"
+
+
 api = responder.API()
-# api.mount('/subapp', other_wsgi_app)
+api.mount("/hello", app)
 
 
 @api.route("/")
@@ -44,7 +55,7 @@ print(
 print(
     api.session()
     .get(
-        "http://app/graph",
+        "http://app/hello/",
         data="{ hello }",
         headers={"Accept": "application/x-yaml"},
         # data="hello",
@@ -53,4 +64,4 @@ print(
 )
 # {hello: Hello stranger}
 
-api.run(port=5000, expose_tracebacks=True)
+# api.run(port=5000, expose_tracebacks=True)
diff --git a/responder/api.py b/responder/api.py
index af3105c..9f0daa1 100644
--- a/responder/api.py
+++ b/responder/api.py
@@ -6,18 +6,28 @@ import waitress
 from whitenoise import WhiteNoise
 from wsgiadapter import WSGIAdapter as RequestsWSGIAdapter
 from requests import Session as RequestsSession
+from werkzeug.wsgi import DispatcherMiddleware
 
 from . import models
 from .status import HTTP_404
 
 
-class BaseAPI:
-    __slots__ = ["routes"]
-
-    def __init__(self):
+class API:
+    def __init__(self, static="static"):
+        self.static_dir = Path(os.path.abspath(static))
         self.routes = {}
+        self.apps = {"/": self._wsgi_app}
 
-    def _wsgi_app(self, environ, start_response):
+        # Make the static directory if it doesn't exist.
+        os.makedirs(self.static_dir, exist_ok=True)
+
+        # Mount the whitenoise application.
+        self.whitenoise = WhiteNoise(self.__wsgi_app, root=str(self.static_dir))
+
+        # Cached requests session.
+        self._session = None
+
+    def __wsgi_app(self, environ, start_response):
         # def wsgi_app(self, request):
         """The actual WSGI application. This is not implemented in
         :meth:`__call__` so that middlewares can be applied without
@@ -44,14 +54,20 @@ class BaseAPI:
             start the response.
         """
 
-        req = models.Request.from_environ(environ)
+        req = models.Request.from_environ(environ, start_response)
+        # if not req.dispatched:
         resp = self._dispatch_request(req)
-
         return resp(environ, start_response)
 
-    def wsgi_app(self, environ, start_response):
+    def _wsgi_app(self, environ, start_response):
         return self.whitenoise(environ, start_response)
 
+    def wsgi_app(self, environ, start_response):
+        apps = self.apps.copy()
+        main = apps.pop("/")
+
+        return DispatcherMiddleware(main, apps)(environ, start_response)
+
     def __call__(self, environ, start_response):
         """The WSGI server calls the Flask application object as the
         WSGI application. This calls :meth:`wsgi_app` which can be
@@ -74,10 +90,18 @@ class BaseAPI:
             except TypeError:
                 try:
                     view = self.routes[route]()
-                # GraphQL Schema.
                 except TypeError:
                     view = self.routes[route]
-                    self.graphql_response(req, resp, schema=view)
+                    try:
+                        # GraphQL Schema.
+                        assert hasattr(view, "execute")
+                        self.graphql_response(req, resp, schema=view)
+                    except AssertionError:
+                        # WSGI App.
+                        req.dispatched = True
+                        return view(
+                            environ=req._environ, start_response=req._start_response
+                        )
 
                 # Run on_request first.
                 try:
@@ -97,25 +121,6 @@ class BaseAPI:
 
         return resp
 
-    @property
-    def static_dir(self):
-        return Path(".")
-
-
-class API(BaseAPI):
-    __slots__ = ("routes", "_session", "whitenoise", "static_dir")
-
-    def __init__(self, static="static"):
-        super().__init__()
-        self._session = None
-        self.static_dir = Path(os.path.abspath(static))
-
-        # Make the static directory if it doesn't exist.
-        os.makedirs(self.static_dir, exist_ok=True)
-
-        # Mount the whitenoise application.
-        self.whitenoise = WhiteNoise(self._wsgi_app, root=str(self.static_dir))
-
     def add_route(self, route, view, *, check_existing=True, graphiql=False):
         if check_existing:
             assert route not in self.routes
@@ -158,6 +163,9 @@ class API(BaseAPI):
 
         return decorator
 
+    def mount(self, route, wsgi_app):
+        self.apps.update({route: wsgi_app})
+
     def session(self, base_url="http://app"):
         if self._session is None:
             session = RequestsSession()
diff --git a/responder/models.py b/responder/models.py
index 4f7c81a..ee8d012 100644
--- a/responder/models.py
+++ b/responder/models.py
@@ -8,7 +8,7 @@ from requests.models import Request as RequestsRequest
 from requests.structures import CaseInsensitiveDict
 from werkzeug.wrappers import Request as WerkzeugRequest
 from werkzeug.wrappers import BaseResponse as WerkzeugResponse
-
+from werkzeug.wsgi import DispatcherMiddleware
 
 from urllib.parse import parse_qs
 
@@ -25,7 +25,7 @@ class Request:
         self._wz = None
 
     @classmethod
-    def from_environ(kls, environ):
+    def from_environ(kls, environ, start_response=None):
         self = kls()
         self._wz = WerkzeugRequest(environ)
         self.headers = CaseInsensitiveDict(self._wz.headers.to_list())
@@ -39,6 +39,9 @@ class Request:
         self.content = self._wz.get_data(cache=True, as_text=False)
         self.text = self._wz.get_data(cache=True, as_text=True)
         self.data = self._wz.get_data(cache=True, as_text=True, parse_form_data=True)
+        self.dispatched = False
+        self._start_response = start_response
+        self._environ = environ
 
         return self