Copenhagen's celebrated theme park and gardens.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Museum dedicated to the terror regimes of Hungary.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

A medieval setting reimagined into a unique art alley.

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

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

"There's nothing there," and other lies the KGB told us.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Saint Borromeo often prayed in this austere crypt during the 16th century.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

A countryside Romanian cemetery filled with colorful crosses bearing lyrical, ironic, or satirical rhymes.

This massive underground salt mine now holds a sci-fi theme park in its depths.

Known as the Hintz House, this medieval pharmacy has been an apothecary's haven for nearly 450 years.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

France's most famous cemetery, with some of its most curious tombs.

A French museum of wrought iron.

An ancient ossuary in Rouen.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.