A 14th century castle built on the seat of a mighty giant.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Sited in an Inner Mongolian desert are the remnants of an important trade stop along the Silk Road.

An ethereal glowing blue ocean cave in Croatia.

An unusual but excellent display created in the 1930s as propaganda against the Freemasons.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

A total of 999 stairs lead visitors through a massive hole in a mountain known as the Gateway to Heaven.

This remote island village was in danger of depopulating completely until a tunnel was built to connect it to the rest of the world .

This spectacular track has run continuously since 1882.

An eccentric collection of antique items shares space with a prop-quality witchcraft museum.

The ruins of a once prosperous power station have become a mouldering seaside gem.

The ruins of a medieval monastery named after a type of tree.

The hidden ruins of an old hydroelectric plant reclaimed by nature.

A little-known ruin with a convoluted history and a fascinating latrine drainage system.

A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

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

An abandoned railroad tunnel is now filled with bioluminescent bugs.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

Moss and stone turn this waterfall into an otherworldly liquid veil.

Legend has it fairies gathered at the site of this medieval castle.