A scenic fort on the harbor protected Philadelphia from an attack that never came.

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Historic Hull Street was actually the first street with a proper name in the Boston area.

The remnants of a Gilded Age elegance preserved in the middle of a stark modern tower.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

The Boston square dedicated to the dark poet who was born nearby.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

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

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

The land is home to swimming ponies and a legendary 18th-century treasure.

This abandoned Victorian-style house was built in 1884.