A mechanized clock where a man fights off a dragon, crab, and rooster.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

Final palace complex of the last of 29 Kokand rulers.

The city-sized home palace of one of ancient Egypt's most powerful rulers gives us a rare look into the lives of the epoch's rulers.

What was once supposed to be the symbol of a shining Afghan future is now a bombed-out ruin.

The royal seat of Henri Christophe, a formerly enslaved man who became Haiti's only king.

The Pope’s secret escape route.

Caligula's colossal pleasure ships, discovered by Mussolini only to be lost in flames.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

Architectural monsters are devouring this palace's every door and window.

2300-year-old Roman road connecting the empire.

Gods clash with machines in a power plant regenerated as a museum.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The odd cement nubs littering this Spanish square are actually the entrances to a series of buried silos.

Captain America, Sub-Mariner, and the Human Torch were all born in this art deco Manhattan masterpiece.

This iron and wood Civil War city-ship was the first vessel to be sunk by an electrically detonated torpedo.

The Egyptian-inspired last resting place of Lord Kilmorey.

A vortex fountain that seems to rise out of the ground.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

Fascinating town where normal life interfaces with the occult.

A 550-square-meter micro-nation off the coast of Britain.

Rare collection of medieval books under lock and key.