One of the most remarkable caves in all of Iceland was created by a once raging river of lava.

An incarceration museum on the spot of possibly the oldest prison in England.

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

A modern English garden of eccentric beasts, follies, and oddities.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

Go deep down into the earth to experience the world of Welsh coal miners.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The highest point in Virginia can only be reached by passing through ponies and flowers.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

The stones of this formerly witch-obsessed castle were used to build a church.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Hundreds of pieces of ancient Taíno art cover the walls of this Caribbean cave system.

Gorgeous cave resemble a winter wonderland.

Ruins of a German Castle on top of a towering stone pillar.

The remains of a chapel created for convenience.

Prehistoric animals decorate this popular outdoor park.

An entire city block built completely out of petrified wood.

A former copper mine which became a truly unsuccessful prison.

The rusting remains of the largest assembled WWII fleet on the West Coast.

Living trees form the structure of an open-air palace.

Former wax museum from the 1960s, home to many wax U.S. Presidents and the famous White House miniature.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.