At 207 feet, one of the world's longest continuous escalators.

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

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

An abandoned stretch of highway, deteriorating next to the operational one.

Outsider art meets paleontology at this roadside reptile repository.