A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

Walk through Czech history in Prague's largest graveyard.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

The final resting place of one of Germany's most accomplished Renaissance men.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

A historic steam train meanders along one of the most scenic rail routes in Germany's Black Forest.

One of the largest caves in the world open to the public.

These spooky and unusual stone formations create an underworldly landscape.

"The most colorful grottoes of the world.

At this Arctic outpost, get to know members of the indigenous Sámi community and meet their herds.

At the very tippity-top of Europe is a cliff from which you can view the midnight sun.

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

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

700 iron sculptures crammed into a Mediterranean park.

This 21st century cabinet of curiosities includes dinosaur bones, moon rocks, film memorabilia, and more.

A cluttered and astounding collection of antiquities and curiosities.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

One of the world's oldest fossil exhibits is on display in a beautiful antique "naturalienkabinett."

A visionary precursor to the Internet made of index cards.

A Saxony castle houses one of the largest and most outstanding mineral collections in the world.