The oldest olive tree in Greece has been bearing fruit for at least 2,000 years.

This famous archeological mystery may be an ancient example of movable type.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Giant marble phalluses on the sacred island of antiquity.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The lavish temple of the Cao Dai religion that includes Buddha, Mohammed, Joan of Arc, and Victor Hugo.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

Sacred Indian temple that’s all monkey business.

The world's second-largest sundial, made entirely out of stone.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

Northern Ireland's Brobdingnagian stepping stones.

Elevated freight railway turned wildly successful urban park.

Remnants of a storybook amusement park hidden behind a strip mall.

Macabre astrological automaton clock dating to the late 1400s.

Famously misunderstood wonder of the ancient world

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.