The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.

A historic covered bridge, only one of two remaining in North Carolina.

A Nessie-like monster supposedly lurks in this lake.

The first statue of Christ sleeping on a bench in the United States confused its affluent parish.

The world's largest wooden structure.

From golden eagles to peregrine falcons, this rehabilitation and education center is a haven for birds of prey.

This nine-story building can be played like an instrument.

Home to the deepest rift anywhere on Earth.

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

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

A beautiful geyser under environmental threat.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

The inspiration for the Patagonia Clothing logo, Cerro Fitz Roy turns pink at sunrise.

Where British troops serving on the remote islands paid tribute to their faraway hometowns.

This haunting ghost ship stands beached in the waters off the coast of the Falkland Islands.

Final resting place of Antarctic explorer Ernest Shackleton.

The birthplace of the very first human resident born in Antarctica.

The best place to send your postcards home from Antarctica.

A psychological self-portrait in the form of a giant, segmented head.

Famously misunderstood wonder of the ancient world

The largest stone circle in the world has ended up bringing up more questions than it has answered.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

At the United Kingdom's only residential library you can sleep among the books.