Otsego Lake, the headwaters of the Chesapeake Bay, was formed by a glacier ten thousand years ago. (Photo by Will Parson/Chesapeake Bay Program)
A trip down Bald Eagle Creek can take visitors back to the Devonian Period, when Pennsylvania was covered by shallow seas. (Photo courtesy of Ruhrfisch/Wikimedia CC BY-SA 3.0, cropped and toned)
Cunningham Falls cascades for 78 feet over resistant metabasalt. (Photo by Will Parson/Chesapeake Bay Program)
Natural Bridge State Park is located on a 1,540-acre property that offers six miles of hiking trails as well as a reconstruction of an 18th century Monacan village. (Photo by Will Parson/Chesapeake Bay Program)
Great Falls Park is located along the Fall Line, where the Piedmont Plateau and Atlantic Coastal Plain meet. (Photo by Kaitlyn Dolan/Chesapeake Bay Program)
The Washington Monument, which is built from three different types of marble, is slowly sinking into the soft ground beneath it. (Photo by Will Parson/Chesapeake Bay Program)
Belemnite fossils preserve part of a now-extinct animal similar to modern squid. (Photo courtesy of Petr Hykš/Flickr CC BY-NC 2.0, cropped, toned and text overlay removed)
The Seneca Rocks formation is made of Tuscarora sandstone, a resistant Silurian-age rock. (Photo by Will Parson/Chesapeake Bay Program)

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