Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

This crescent-shaped sliver of sand is a magical haven for a herd of feral horses.

The twists and turns of this serpentine maze are over 170 years old.

A sturdy relic of Britain's once crucial gunpowder industry is now a haunting Cornish ruin.

Giant granite rocks standing end-to-end like a train of circus elephants.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

Modern technology and live displays tell the story of the Pacific during WWII for the Internet generation.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

One of Ireland's most infamous prisons for rebels including men, women and children.

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

An outstanding and haunting glimpse of the horrors of the Great Famine of Ireland.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

This posh mansion began as a family's estate and ended as the site of a murder ripped from the pages of a pulp novel.

Quality time with reindeer in the stunning scenery of their natural Lappish habitat above the Arctic Circle.

The wreckage of a tragic plane crash is on display at this museum devoted to a famous Italian conspiracy.

What was once the base for Russia's first nature reserve is now a ghost town, right on the shore of Lake Baikal.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

A castle-like sea fort from the 17th century is now a museum to oyster farming.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

These mouldering mansion ruins remember a time when the Catskills were nothing but luxury.

The northernmost point in Denmark is a turbulent sandbar created by two clashing seas.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.