In 1971 the C&O Canal was designated a national historical park. To commemorate its 40th anniversary, the National Park Service and the C&O Canal Trust are unveiling 40 hidden gems in the park over 40 weeks. These discoveries, located throughout the park's 184.5 mile length, will:

• Take you places you've not yet explored, right here in your own backyard,
• Tell the stories the park rangers most love to share,
• Deepen your appreciation and understanding of one of America's great historical parks.

Check out the map below to find a discovery nearby or, better yet, find a new spot and experience the C&O Canal as never before.

Click on any site listed below to begin your exploration. Podcast available.
Mileposts 0 - 19 Tide Lock Alexandria Aqueduct Incline Plane Fletchers Cove Abner Cloud Mill Lockhouse 6 Lockhouse 8 Lockhouse 10 Seven Locks Widewater Anglers Stop Gate Great Falls Tavern Gold Mine Trails Mather Gorge Swains Lock Pennyfield	Mileposts 20 - 39 Blockhouse Point Riley's Lock & Seneca Edwards Ferry Lock 26 Mileposts 40 - 59 Monocacy Aqueduct Point of Rocks Catoctin Aqueduct Brunswick Appalachian Trail Mileposts 60 - 79 Harpers Ferry Fort Duncan Ferry Hill Killiansburg Cave	Mileposts 80 - 99 Big Slackwater Dam 4 Cushwa Basin Lockhouse 44 Williamsport Mileposts 100 - 119 Four Locks McCoys Ferry Mileposts 120 - 139 Bowles House Round Top Cement Mill Western Maryland Rail Trail Indigo Tunnel	Mileposts 140 - 159 Little Orleans Lock 65 Paw Paw Tunnel Mileposts 160 - 184.5 Oldtown Spring Gap Cumberland Terminus Cumberland
Discover even more gems with the Potomac Heritage Explorer.