diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -2864,6 +2864,7 @@
     'PhabricatorProjectMembersEditController' => 'applications/project/controller/PhabricatorProjectMembersEditController.php',
     'PhabricatorProjectMembersPolicyRule' => 'applications/project/policyrule/PhabricatorProjectMembersPolicyRule.php',
     'PhabricatorProjectMembersRemoveController' => 'applications/project/controller/PhabricatorProjectMembersRemoveController.php',
+    'PhabricatorProjectMilestonesController' => 'applications/project/controller/PhabricatorProjectMilestonesController.php',
     'PhabricatorProjectMoveController' => 'applications/project/controller/PhabricatorProjectMoveController.php',
     'PhabricatorProjectNameContextFreeGrammar' => 'applications/project/lipsum/PhabricatorProjectNameContextFreeGrammar.php',
     'PhabricatorProjectNoProjectsDatasource' => 'applications/project/typeahead/PhabricatorProjectNoProjectsDatasource.php',
@@ -2883,6 +2884,7 @@
     'PhabricatorProjectSlug' => 'applications/project/storage/PhabricatorProjectSlug.php',
     'PhabricatorProjectStandardCustomField' => 'applications/project/customfield/PhabricatorProjectStandardCustomField.php',
     'PhabricatorProjectStatus' => 'applications/project/constants/PhabricatorProjectStatus.php',
+    'PhabricatorProjectSubprojectsController' => 'applications/project/controller/PhabricatorProjectSubprojectsController.php',
     'PhabricatorProjectTestDataGenerator' => 'applications/project/lipsum/PhabricatorProjectTestDataGenerator.php',
     'PhabricatorProjectTransaction' => 'applications/project/storage/PhabricatorProjectTransaction.php',
     'PhabricatorProjectTransactionEditor' => 'applications/project/editor/PhabricatorProjectTransactionEditor.php',
@@ -7207,6 +7209,7 @@
     'PhabricatorProjectMembersEditController' => 'PhabricatorProjectController',
     'PhabricatorProjectMembersPolicyRule' => 'PhabricatorPolicyRule',
     'PhabricatorProjectMembersRemoveController' => 'PhabricatorProjectController',
+    'PhabricatorProjectMilestonesController' => 'PhabricatorProjectController',
     'PhabricatorProjectMoveController' => 'PhabricatorProjectController',
     'PhabricatorProjectNameContextFreeGrammar' => 'PhutilContextFreeGrammar',
     'PhabricatorProjectNoProjectsDatasource' => 'PhabricatorTypeaheadDatasource',
@@ -7229,6 +7232,7 @@
       'PhabricatorStandardCustomFieldInterface',
     ),
     'PhabricatorProjectStatus' => 'Phobject',
+    'PhabricatorProjectSubprojectsController' => 'PhabricatorProjectController',
     'PhabricatorProjectTestDataGenerator' => 'PhabricatorTestDataGenerator',
     'PhabricatorProjectTransaction' => 'PhabricatorApplicationTransaction',
     'PhabricatorProjectTransactionEditor' => 'PhabricatorApplicationTransactionEditor',
diff --git a/src/applications/project/application/PhabricatorProjectApplication.php b/src/applications/project/application/PhabricatorProjectApplication.php
--- a/src/applications/project/application/PhabricatorProjectApplication.php
+++ b/src/applications/project/application/PhabricatorProjectApplication.php
@@ -60,6 +60,10 @@
         'picture/(?P<id>[1-9]\d*)/'
           => 'PhabricatorProjectEditPictureController',
         'create/' => 'PhabricatorProjectEditDetailsController',
+        'subprojects/(?P<id>[1-9]\d*)/'
+          => 'PhabricatorProjectSubprojectsController',
+        'milestones/(?P<id>[1-9]\d*)/'
+          => 'PhabricatorProjectMilestonesController',
         'board/(?P<id>[1-9]\d*)/'.
           '(?P<filter>filter/)?'.
           '(?:query/(?P<queryKey>[^/]+)/)?'
diff --git a/src/applications/project/controller/PhabricatorProjectController.php b/src/applications/project/controller/PhabricatorProjectController.php
--- a/src/applications/project/controller/PhabricatorProjectController.php
+++ b/src/applications/project/controller/PhabricatorProjectController.php
@@ -151,6 +151,12 @@
     $nav->addIcon("members/{$id}/", pht('Members'), 'fa-group');
     $nav->addIcon("details/{$id}/", pht('Edit Details'), 'fa-pencil');
 
+    if (PhabricatorEnv::getEnvConfig('phabricator.show-prototypes')) {
+      $nav->addIcon("subprojects/{$id}/", pht('Subprojects'), 'fa-sitemap');
+      $nav->addIcon("milestones/{$id}/", pht('Milestones'), 'fa-map-marker');
+    }
+
+
     return $nav;
   }
 
diff --git a/src/applications/project/controller/PhabricatorProjectFeedController.php b/src/applications/project/controller/PhabricatorProjectFeedController.php
--- a/src/applications/project/controller/PhabricatorProjectFeedController.php
+++ b/src/applications/project/controller/PhabricatorProjectFeedController.php
@@ -35,7 +35,6 @@
 
     $nav = $this->buildIconNavView($project);
     $nav->selectFilter("feed/{$id}/");
-    $nav->appendChild($box);
 
     $crumbs = $this->buildApplicationCrumbs();
     $crumbs->addTextCrumb(pht('Feed'));
diff --git a/src/applications/project/controller/PhabricatorProjectMilestonesController.php b/src/applications/project/controller/PhabricatorProjectMilestonesController.php
new file mode 100644
--- /dev/null
+++ b/src/applications/project/controller/PhabricatorProjectMilestonesController.php
@@ -0,0 +1,33 @@
+<?php
+
+final class PhabricatorProjectMilestonesController
+  extends PhabricatorProjectController {
+
+  public function shouldAllowPublic() {
+    return true;
+  }
+
+  public function handleRequest(AphrontRequest $request) {
+    $viewer = $request->getViewer();
+
+    $response = $this->loadProject();
+    if ($response) {
+      return $response;
+    }
+
+    $project = $this->getProject();
+    $id = $project->getID();
+
+    $nav = $this->buildIconNavView($project);
+    $nav->selectFilter("milestones/{$id}/");
+
+    $crumbs = $this->buildApplicationCrumbs();
+    $crumbs->addTextCrumb(pht('Milestones'));
+
+    return $this->newPage()
+      ->setNavigation($nav)
+      ->setCrumbs($crumbs)
+      ->setTitle(array($project->getName(), pht('Milestones')));
+  }
+
+}
diff --git a/src/applications/project/controller/PhabricatorProjectSubprojectsController.php b/src/applications/project/controller/PhabricatorProjectSubprojectsController.php
new file mode 100644
--- /dev/null
+++ b/src/applications/project/controller/PhabricatorProjectSubprojectsController.php
@@ -0,0 +1,33 @@
+<?php
+
+final class PhabricatorProjectSubprojectsController
+  extends PhabricatorProjectController {
+
+  public function shouldAllowPublic() {
+    return true;
+  }
+
+  public function handleRequest(AphrontRequest $request) {
+    $viewer = $request->getViewer();
+
+    $response = $this->loadProject();
+    if ($response) {
+      return $response;
+    }
+
+    $project = $this->getProject();
+    $id = $project->getID();
+
+    $nav = $this->buildIconNavView($project);
+    $nav->selectFilter("subprojects/{$id}/");
+
+    $crumbs = $this->buildApplicationCrumbs();
+    $crumbs->addTextCrumb(pht('Subprojects'));
+
+    return $this->newPage()
+      ->setNavigation($nav)
+      ->setCrumbs($crumbs)
+      ->setTitle(array($project->getName(), pht('Subprojects')));
+  }
+
+}