A completely underwater art museum sends a stark message about humans' impact on the environment.

A landscape decorated with enormous skull sculptures.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

Rare recess caves fill this unbelievably beautiful Ohio park.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

A taste of the macabre Tokyo's ritzy shopping district.

If Hello Kitty were Mickey Mouse, this would be Disneyland.

A magical place that lets you play in and explore the world of Studio Ghibli.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

A museum in the childhood house of a medical pioneer.

Museum dedicated to the terror regimes of Hungary.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

This cemetery features modernist statues as strange as its name.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

It turns out that a hurricane-prone beach is probably not the best place to house wild animals.

Neglected resting place of some of the city's early luminaries—and a woman encased in concrete.

The best place in the world to buy tinned fish.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.