The oldest arboretum on the Dalmatian coast doubles as the gardens of Kings Landing in "Game of Thrones."

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

Once a state-of-the-art tuberculosis treatment spa, these ruins are now ruled by paintball players.

Humble beginnings for one of the world's most famous scientists.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

Yugoslavia's biggest underground airport lies in ruins.

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

A wonderfully strange collection of 500+ stuffed frogs doing people things.

Where the lovelorn find a home for their sentimental keepsakes.

A musical instrument played by the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Descend into the tunnels to experience the life of a coal miner.

Potato-peeling mannequins, Inca art, and a dangling tuber mobile help trace the history of fries at this Belgian museum.

A Museum of Psychiatry in a still-operating mental institution.

This modern arts center is built around a gem of late-Baroque architecture.

A rare example of World War I trenches from the British front.

Medical history with an amazing, if frighting, collection of wax diseases on display.

Theme park featuring miniature replicas of European monuments.

This abandoned Belgian fortress is purposefully being left to nature.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

This ghost town in Belgium will lose its street art when it ceases to exist.