D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

The house where John Wilkes Booth conspired with his co-conspirators.

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

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

A state park that once served as an important river crossing, and now offers protected lands for endangered plants and animals.

Montreal's colorful subway station shows its support of the local LGBT+ community.

One of the best places to see feral Colonial Spanish Mustangs in the United States.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

Featuring the the longest lift span of any vertical-lift bridge in the world.

This kitschy tavern is also home to rare early editions of "Treasure Island."

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

A clone of a cloned tree that was so important it allegedly had its own guards.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

This suburban house is made of dirt, and almost sparked a revolution in home construction.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

This Rhode Island mansion was a stand-in for the exteriors of Collinwood in the original "Dark Shadows" series.

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

The world's oldest continuously operating airport was founded by the Wright Brothers.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

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

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