Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

This grand gothic brewery has been pumping out suds for over a hundred years.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

Before Nixon, "watergate" meant canals.

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

This mouldering abandoned mental hospital was once a center for progressive healing.

The life of one of FDR's possible mistresses is preserved in her palatial Hudson Valley mansion.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

One man's swirling six-acre monument of stone.

Decades before the scandal, this staircase on the river was a literal "water gate."

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

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

The kind of mixed-up place that drives archaeologists crazy.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

"Call for the doctor, call for the nurse... Vote!! said the lady with the alligator purse."