A terrific purveyor of natural history objects and curios.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.

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

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

Spain's stunning solar energy plant.

The world's largest wooden structure.

The final resting place of the great navigator, or maybe his brother.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The Victoria-era quarantine station for Sydney.

The ruins of a once prosperous power station have become a mouldering seaside gem.

An abandoned marine theme park has created a difficult experiment in dolphin rewilding.

This historic Melbourne bullet factory is fully encased in a massive glass and steel cone.

Come for the flowers, stay for the bats!

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

Alien rock formations grown from the sands of an Australian national park.

Nature is leading a successful mutiny on this century-old freighter.

Jesus' footprints and the first catacombs in the world.

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

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

2300-year-old Roman road connecting the empire.