Vast network of air raid tunnels beneath Lombardy's capital.

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

See what remains of a once grand ancient Roman circus.

This poignant art installation raises awareness of violence against women.

The odd depiction of the Virgin Mary and baby Jesus is rooted in the Catholic Church's eradication of Catharism.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

In the 1940s, Italian architect Mario Cavallè built a dozen of these round homes in northern Milan.

This small Milan street is filled with colorful homes and a rich history.

A Milanese café entirely designed by the American director Wes Anderson.

In the city forest of Augsburg are oval, artificial ponds formed from a World War II bombing campaign.

Hidden in the forest are the crumbling, graffiti-covered remains of the factory where most of Germany's explosives were produced during World War II.

Deep in the forest next to Augsburg are abandoned bunkers and bullet traps from the region's military past.

These blingy, baubled skeletons lie in glass boxes inside a baroque Bavarian church.

A whimsical art tower at a Bavarian brewery includes a grotto for its mythical beer-brewing dwarves.

The name doubles as an appropriate adjective for this small ossuary.

Home of the largest single-phase AC generator in the world.

The prison where Hitler wrote "Mein Kampf," and 278 Nazis were later executed for war crimes.

Destroyed numerous times, this centuries-old bridge has always been rebuilt with its original design.

Machismo turned on its head: the lady's hand goes to the dude with the bigger brain.

The 1940s structure houses what was once Europe's largest telescope.

This Italian foot path winds through the mountains via 52 individual tunnels.

An open-air museum in a mountain valley features works designed to blend in with—and disintegrate back into—their natural surroundings.

These caves are home to a small church and were used to age cheese.