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

An Austrian house of bones filled with hundreds of intricately painted skulls.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Art and armour fill every inch of this rich kid's Italian villa.

An incredible menagerie of more than 3 million taxidermied animals at the oldest science museum in Europe.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

The largest and most famous wax anatomical collection anywhere in the world.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

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.

Tucked away in a downtown Stockholm park are the remains of a World War II defense position.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

Stockholm's narrowest alley is barely over two feet wide.

Stockholm's tiniest statue is of a small boy looking at the Moon.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Sweden's "good old days" painstakingly re-created in a model village.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.