A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

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

One of the last mosaic tile facades found in the city.

The final residence of an educator, civil rights leader, and presidential advisor was also the first headquarters of the National Council of Negro Women.

Home to a 27 room house, this estate was crafted by Black entrepreneur Olander Banks Sr.

The only remaining African American schoolhouse in northern Virginia is now a museum dedicated to formerly enslaved people.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

The historic home of an educator, abolitionist, activist, and poet.

A statue commemorate Tommie Smith and John Carlos's brave protest at the 1968 Olympics, a watershed moment for civil rights.

A grumpy old water goblin guarding an old mill on the Devil’s Stream in Prague.

A significant example of Czech cubist architecture—a style you won't find anywhere else in the world.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

An existential riddle in the world's largest ancient castle.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

Art and a pun, all in one.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

An eerie, derelict amusement park in Berlin.

"The prettiest love letters in the world" ... or so said Lord Byron.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

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

An amazing example of Federal-period architecture, truly unique to this region of the state.