In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

The mummified relic of St. Catherine sits forever on a golden throne.

Italy's curious field of mud volcanoes is named for being both gross AND salty.

A rambling museum which honors the beauty in everyday objects.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

The mark of the Devil's horns on a marble column in Milan.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.

This beautiful system of tunnels built into natural rock serves as a centuries old plumbing system.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

Crawling into this primordial cave may feel disconcertingly familiar.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

Wars fought and wars won are remembered by these abandoned bunker ruins.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

This ancient city - home to nine civilizations - is soon to be buried under 200 feet of water.

A bathhouse from the second Islamic Caliphate decorated with frescoes of constellations, pleasure gardens, and naked ladies.

One of Hungary's most influential places of learning is also home to one of the world's most beautiful libraries.

A trio of giant wooden megaphones turn up nature's volume in this Estonian forest.

Sweden's oldest animated sign is still lighting up the skyline today.

What almost started out as a spite house became an eccentric's found object masterpiece.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

The ancient ruins of an extinguished city amidst the bustle of a modern one.

This magnificent Crimean estate was once a playground of the Russian elite.

This stoic bronze soldier stands as a symbol of Russian sacrifice or Soviet oppression, or maybe both.