A brutalist gem towering over the heart of Milan.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

One part local history, 99 parts gruesome haunted house.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

This historic electric train has operated with regularity since the early 1900s.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Bohol's mysterious brown hills.

Five miles of underground river link lake to ocean.

This unusual island has a winding sand bridge that only appears at low tide.

This curious fresh and salt water lake holds a secret that draws in deep divers from around the world.

An eatery in a shallow river where diners can enjoy their meal mere feet from the base of an artificial waterfall.

A patch of Philippines forest devoted to saving the lives of an emotionally sensitive species of googly-eyed primates.

This small city park is best known for the nightly convergence of thousands of shrieking parakeets.

A park with one large cat sculpture and 15 smaller ones, all painted by different Colombian artists.

An unusual and beautiful form of mass transit serves the city's steepest neighborhoods.

Outdoor escalators and art have helped change what was once a notoriously dangerous part of Medellín.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

The Andean town where every single building is decorated with a brightly colored frieze.

The world's tallest palm trees look like the whimsical kind of plant you'd find in a Dr. Seuss story.

Cathedral carved out of salt, located a mile below the earth's surface.