Enter the cabin of a life-sized Hindenburg replica.

The great Danube river starts here.

A breathtaking viewing platform over the Alps.

This overgrown mountain village has been abandoned for nearly a century.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

The narrowest street in the world is in danger of closing up entirely.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

A spiral staircase twists to the top of this unusual Czech lookout tower.

A unique opportunity to stay the night in retrofitted sections of sewer pipe.

Heralded as one of the prettiest castles in all of Czechia.

Shimmering sea-colored mosaics and Jesus statues cover this opulent building.

A whimsical art tower at a Bavarian brewery includes a grotto for its mythical beer-brewing dwarves.

One of the most easily accessible examples of the rare 1960s UFO houses.

A striking 12th-century-style castle built on the edge of a cliff.

This is what trains will look like after the zombie apocalypse.

A World War II torpedo launch station abandoned off the Polish coast.

A collection of old neon signs from all over Poland line a secluded courtyard.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

In this breathtaking canyon, crocodiles bask on boulders and glide through the murky waters.

This beautifully deceptive waterfall is something far different from what it appears to be.

This series of waterfalls tumble into a radiantly blue river.

The enigmatic and seldom visited ruins of a Mayan city-state.

Trek through the jungle on a boat and a swinging bridge and you'll be rewarded with these refreshing, if pungent, mineral pools.

This singular broken monument, now housed in a museum, was the cause of a worldwide "Mayan Doomsday" phenomenon.