There's an old indoor swimming pool hidden directly underneath the White House Press Briefing Room.

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

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

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

142 ceramic steps become a mosaic once a year.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

The ghost town where the villagers refuse to leave.

An ethereal glowing blue ocean cave in Croatia.

This Croatian island is for sale but no one is buying due to the dozens of accused Nazi sympathizers who were massacred there after WWII.

A full figure 4th century incorruptible saint lies in a glass coffin in Croatia.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

An ancient knight and a symbol of the city's freedom.

Venice's island of the dead.

Pilgrimage site for star-crossed lovers.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

Venice's "Island of the Mad."

A sunken idol welcomes parishioners to Davy Jones' Locker.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

Five candy-colored villages on the Italian Riviera.

This ultra-modern burial building would have stacked the dead like a giant filing cabinet.

Architectureal fantasy quarter of Rome.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The yawning maw of this pagan visage is said to bite off the hands of liars.