The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

The last bastion of Roman presence north of the Alps looms over a German town.

The "Prussian Versailles" that is as glorious today as when it was built.

The most visited, and possibly most controversial, museum in Germany.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A 'living museum' in Leiden, the oldest of its kind in the Netherlands.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

A grassy pyramid named after a French battle.

This large sand dune in the Netherlands is home to wind-whipped trees with "floating" roots.

Amsterdam's former hotspot for public executions and dissections.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

A beautifully eclectic mix of architectural styles.

The cemetery houses the remains of Jun’ichirō Tanizaki, one of Japan's most famous novelists.

Turn around and stick your head between your legs for the best view of this tree-covered sandbar.

Japan's largest collection of Western-style mansions in the port city of Kobe includes a recreation of Sherlock Holmes' 221B Baker Street quarters.

This ancient shrine has been rebuilt every 20 years since the eighth century.

Japan's largest and oldest annual procession of floats, begun in 869.

Crawl through the hole in the middle of this stone to break off a bad relationship or initiate a good one.

A shrine contains nearly 200 statues of the Buddhist deity Jizo, dressed in bibs by parents who have lost a child.

This little replica of Lady Liberty provides a bit of NYC in a Japanese city.