The remains of a grand castle that may have inspired Bram Stoker's Dracula.

This stunning limestone waterfall is the highest in Estonia.

A creek tumbles over a series of step-like rocks to create this scenic water feature.

Rushing water plunges over a 100-foot drop created by an ancient lava flow at this majestic waterfall.

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

This mountain is one of the largest in Scotland but is better known for its hollow insides.

Overlooking a Scottish loch, this beautifully crumbling castle once inspired a poem by William Wordsworth.

The location of the Bridge of Death and the Gorge of Eternal Peril in "Monty Python and the Holy Grail."

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

This memorial museum chronicles the apocalyptic destruction of the First World War.

A moving memorial to the fallen and missing from WWI trenches.

A Cold War command center is hidden under an idyllic countryside.

The biggest and deepest Cold War bunker open to the public can be found in southeast England.

America's post-nuclear-attack chambers of Congress.

Home of a 28-foot tall stalagmite known as the War Club.

This former fire tower is now a rustic observatory that offers amazing views of eagles, hawks, and the Appalachian Mountains.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

Stroll through a wonderland of stupendous moss-covered trees.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

This Canadian island is a veritable garden of decay with countless abandoned structures dotting the landscape.

This amazingly preserved Gold Rush town is a historian's dream.