This colonial mansion has been home to a staggering number of American historic figures.

A daily replay of the experiment that proved the rotation of the Earth.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

This dramatic rail curve was once the target of a failed Nazi attack.

This elaborate towering structure was once famed for its revolutionary height.

A local prank turned town icon.

This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.

Yo, Adrian!

A historic covered bridge is but one example of an oddly prevalent American urban legend.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

Less a museum than a bizarre fantasy world created by artists and engineers.

Toxic waste disaster that founded the Superfund program.

A natural gas leak provides a flickering flame beneath a waterfall.

Elevated freight railway turned wildly successful urban park.

America's largest man-made forest was planted in an effort to bring back the past.

This erect, phallic geological spire wasn't always named so domestically.

An experimental, automotive replica of Stonehenge.

Every president in history is immortalized in bronze in downtown Rapid City.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.