London's marvelous wildfowl reserve along the Thames.

American bombs, morbid memorabilia, and graphic photographs tell the story of the CIA-led “Secret War” from the Pathet Lao perspective.

This foreboding medieval castle was twice besieged by barons rebelling against the English king.

A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

These semi-natural waterfalls hint at the park's Victorian-era industrial past.

The steel cable lets adventurers zoom between two mountain towns at speeds of up to 75 miles per hour.

A collection of machines designed to break things for science.

This spectacular mosque houses the second-largest chandelier in the world.

Spend the night in this formerly abandoned traditional Scottish village.

This high-speed test track is popular with car manufacturers, speed freaks and orbiting astronauts.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

The largest medieval water tank on the Iberian Peninsula is preserved beneath the Cáceres Museum.

The world's oldest family-run magic shop is hidden beneath a bustling London thoroughfare.

These ornate arches show how the course of the River Thames has changed.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

Hidden beneath the streets of London is a secret subway that only carried mail.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

These mysterious mazes carved on the rock may be up to 4,000 years old.

A market built atop boats is one of the few floating holiday markets in Europe.

A little slice of Japan and its aesthetics in London's Holland Park.

An otherworldly alpine pasture with its own unique microculture that recalls Middle Earth.

This ruined 15th-century hermitage is steeped in myth and mystery.

Buried for centuries, this hidden cellar is all that remains of London's medieval Whitefriars Monastery.