This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

An underground city of salt.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

An ornate plague column – built to celebrate life – claimed the lives of numerous artisans during its construction.

Every part of this unusual home is built into the sandstone rock.

Be(w)ar(e) the moat around this historic Czech castle.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Mummified monks and the accidentally interred, in a 17th-century crypt.

A spiral staircase twists to the top of this unusual Czech lookout tower.

Europe's second largest ossuary wasn't discovered until 2001.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

Walk through Czech history in Prague's largest graveyard.

Two stunning 17th-century libraries and a cabinet of curiosities.

A church of bones, decorated with 40,000 human skeletons.

Travel deep inside of Europe's second largest glacier in the world's largest man-made ice cave.

Three columns of volcanic rock shoot out of the ocean.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

The oldest church in Iceland is one of the few to feature ornate decoration.

A little-visited waterfall in an otherworldly landscape.

The most powerful waterfall in all of Europe.

This elegant arc of a waterfall marks a religious turning point.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This fantastical waterfall is hidden in a cave located in a cracked cliff.