The highest point in Maine is a grand gift to the state citizens that also happens to be one end of the Appalachian Trail.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

This poor little statue is the most vandalized memorial in Washington.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

The walls of the iconic dome are hollow and have a secret stairway.

Every drop of D.C. tap water flows through this old waterworks.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

A perfect circle of twenty-four mysterious holes dates back to prehistoric time.

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

A failed piece of Orientalism has become the proud symbol of a community.

In which a local geological marvel becomes a quaint roadside attraction.

This jail which was in service for over a century is now open for curious visitors.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

A community of collapsing homes more than a mile out from the Florida coast.

Over 120,000 curious objects that have shaped our modern world.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

America's post-nuclear-attack chambers of Congress.