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

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

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

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

The national park was once a plantation estate.

The "lovely red Vega" of the legendary record-settling pilot.

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

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

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

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

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

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

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

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

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

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

People escaping slavery may have hidden inside a corpse vault.

A haunting tribute to pioneering photographer Clover Adams.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

Largest Roman Catholic church in North America.

The most decorated dog of World War I is preserved in the Smithsonian.