One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

This picturesque medieval monastery guards a small trove of historic treasures.

Gargoyle head that brings good luck.

Where the lovelorn find a home for their sentimental keepsakes.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Bridge that died in war and was resurected.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

Old Danish castle immortalized in Shakespeare's Hamlet.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Home to three historic ships from the age of Vikings.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

Böttcherstraße's bells, extolling Nordic virtues and the great conquerors of the world.

Hamburgers are intensely proud of their tunnel beneath the river.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.