A Nesting Doll of Churches.

A fortified medieval basilica on the Caelian Hill preserves extraordinary frescoes and one of Rome's most beautiful hidden cloisters.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

The museum houses one of the world's largest shoe collections, boasting over 12,000 pairs.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

From carts to cars, this leftover Roman bridge in France has managed to survive for centuries.

The castle where the Marquis de Sade lived out his darkest fantasies.

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

From here, the loch appears to take the shape of mainland Scotland.

Largest lake in Great Britain measured by surface area.

Nestled amid the peaks and lochs of the Scottish Highlands, this inn and pub has played host to outlaws and ghosts.

A close look reveals that the Scottish monument is just slightly off-kilter.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

The last manually operated turntable ferry in the world.

On this stunning Scottish island, you can walk in the footsteps of dinosaurs.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

Ancient cliffs resembling a kilt on Scotland’s second-largest island emit an entrancing sound.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

These fantastically named natural pools look like something out of a Scottish myth.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

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