A 14-foot monument marks the resting place of two of the town's earliest residents—and one unknown soldier.

This little brick tunnel built by Confederate forces was used to conduct surprise attacks on the railroad.

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

A graveyard that dates back over 200 years stands near a busy shopping center.

A suburban museum tells the story of a historic transportation network and even provides rides in antique trolley cars.

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

Once forgotten and built over, this historic Black cemetery now houses a poignant memorial.

An eccentric company offers eccentric millionaires the opportunity to have spaceflight-related experiences.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

Dogs, cats, horses, monkeys, frogs, and fish are laid to rest at the second-oldest pet cemetery in the U.S.

A massive, majestic mammal watches over pedestrians from his perch atop a former B.P.O.E. lodge.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

An original apothecary from 1792.

A former major munitions plant that has been converted into a sprawling art space.

An allegorical sculpture in Maryland wears the artist’s politics on its trunk.

These figures float and flutter in this fountain crafted by famed Swedish sculptor Carl Milles.

The narrowest house in America is seven feet of pure spite.

Hidden within an idyllic suburban garden is a memorial dedicated to the victims of a terrifying spree of killings committed on U.S. soil.

Two dozen pinball games hidden away inside a most unlikely location.

A historic cemetery filled with quirky faux wood art and unique tombstones.

A whopping 14,000 copper coins cover this miniature fighter jet.

An unusual sculpture, an interesting history, in a strange place, for a good cause.

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

One of the largest collections of Catalan literature and cultural materials outside of Spain, created by a community of 1960s expats.