The ruins of this medieval tower are destined to crumble into the sea.

Flames have been burning within this mountain for more than 2,500 years.

These ruins of a medieval church are full of architectural mysteries.

The most remote tree in the world is more than 170 miles from its nearest neighbor.

These legendary stone steps were once used to haul coffins up the rockface.

The commemorative stone column conceals a secret laboratory.

This single-track road rewards brave drivers with stunning Scottish scenery.

It houses the remains of a 17th-century version of the Titanic.

This grisly exhibit houses skeletons and weapons from a devastating 14th-century clash.

This Scottish castle has witnessed clan rivalries, Jacobite uprisings, whisky smuggling, and more.

This riverside restaurant has been serving customers since 1146.

This ancient Irish landscape boasts hundreds of legendary ruins.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

The "Bridge Over the Atlantic" lets you cross the waterway in mere seconds.

A verdant 17th-century-style garden hidden along Edinburgh’s Royal Mile.

This Gothic castle-like portal is a testament to the amazing craftsmanship of the navvies who built the railway tunnel.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

An extraordinary mix of Phoenician, Roman, early Christian, and Byzantine ruins beautifully set overlooking the Mediterranean.

This natural wonderland is a unique chance to explore a Carolina bay, a mysterious geological formation of unknown origin.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

This restaurant proudly displays bread signed by the 39th president.

The ruins of an abandoned church loom within a picturesque Ukranian village.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

This 17th-century pub once had a hole in its wall so the neighboring blacksmith could easily access beer.