A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

There’s a hidden military meme engraved on the World War II Memorial.

There's a crumbling old mansion inside the Smithsonian National Zoo.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

This poor little statue is the most vandalized memorial in Washington.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

It was once the base for a series of domestic terror attacks.

A historic neighborhood church is reborn as a psychedelic arts collective.

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

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

An Industrial Revolution-era public work that purified water using nothing but sand.

A haunting tribute to pioneering photographer Clover Adams.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

An eerie, decaying ghost town destined to fade into the forest.

Remnants of a storybook amusement park hidden behind a strip mall.

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

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

These lush botanical gardens employ the most purrfect pest control force.

A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.