This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

One of the largest squares in Europe contains an entire artificial island.

The oldest botanical garden in the world that technically isn't the oldest.

The silly symbol for an underground protest group is now scattered around the city.

This oddly beautiful water cistern is a techno-temple to the wet stuff and a multimedia masterpiece.

Relive a Polish uprising via an enormous, century-old cyclorama.

A fearsome dragon clings to a corner of Munich's city hall.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Europe’s oldest natural human mummy.

This splendid tomb may look fantastic, but there's nothing in it...

Archduke Ferdinand II's collection of rare objects is considered one of the oldest museums in the world.

Devilish masks, handicrafts, and pieces of old buildings create a snapshot of life in a historic Alpine region.

This historic floating crane became an unlikely symbol of the port of Trieste.

One of the tallest lighthouses in the world also serves as a monument to the fallen of World War I.

One of the largest caves in the world open to the public.

This Roman monument is surrounded by more recent construction, offering a stark contrast between ancient architecture and the modern urban landscape.

The "dragon babies" of southeastern Europe.

A miniature train-ride through Slovenia's largest cave system.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

This one-time health resort was used by aristocrats around the world.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.