A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A wondrous old library overlooking the nation's capital.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

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

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

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

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

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Home to items never before seen by the public.

The site of the climactic scene from the classic horror film is now a historic landmark.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

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

A celebrity from the late Cretaceous period.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

When it opened during the final years of the embargo, all the drinks and cigars were free.

The first memorial dedicated solely to the Black troops who fought for the Union.

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

The United States Capitol's former columns still stand.

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

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

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

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