This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

First built around 1848, this bridge was destroyed by arson, but original timbers are included in the replacement.

The ruins of an 18th-century mansion that was once named "Mistake" by the man who had it built.

Built in 1815, the stabilized ruins of the grist mill and sawmill are now gated, but interpretive displays on the features and functions of the mill preserve its history.

The hidden ruins of a mill that is linked to an attempt to assassinate the vice president of the United States.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

A relic of FDR's brief foray into utopian urban planning.

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

One of Gettysburg’s least visited battlefield memorials is off the beaten path, but worth a visit.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

The 32nd president's sprawling cottage sits on an island enclave jointly managed by the U.S. and Canada.

A quarter mile off the coastal tip of Maine you'll find the "Beloved Island" of Franklin Delano Roosevelt.

A rare opportunity to drive across the ocean floor.

These powerful, if squat, Canadian waterfalls flow in different directions depending on the time of day.

A mysterious spot where the laws of gravity seem not to apply.

Iconic rock formations that allow for exploration during high or low tide.

A Yiddish theater turned movie house turned rock and roll landmark turned gay disco turned bank.

Test your business savvy and play the market for cocktails at this stock exchange-inspired watering hole.

For almost a century, this East Village newsstand has served egg creams to beats, hippies, punks, and everything in between.

On the top floor of an upscale department store stands a lavish restaurant housed in a replica of a luxury French dining car.

Walk over a 150 year old manhole.

If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

Amid skyscrapers and traffic exists this unique aquatic ecosystem.

This simple Manhattan salt house is artfully shaped... well, like a giant granule of salt.