These tombs were built into the side of a mountain so that ancient angels could reach the dead.

One of the best-preserved medieval streets in Europe.

This secret coastal village is studded with pastel-colored houses all piled on top of one another.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

An 800-year-old island castle in Guernsey's main harbor.

One of the world's smallest prisons boasts just two small cells.

The first island in the world designated a light-pollution-free astronomical observation point.

Greenland's first shopping mall also hosts the country's government.

The remains of St. Lucius of Chur were said to be kept in this crypt for several centuries.

The world's largest second-hand graces a clock surrounded by constantly changing flower beds. 

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

This charming Latvian lane doubled as Baker Street on the Soviet Union’s version of Sherlock Holmes.

The reconstruction of this prominent building fulfilled a long-written command.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

A century-old prison in the heart of Vilnius is now a lively bar, dance club, and artist residency.

Over time, this castle grew to encompass the entire island.

Museum deep in the catacombs of St. Michael the Archangel Church is explored by touch, sound, and smell.

A narrow strip of land is home to the tallest migrating dunes in Europe.

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

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

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

Strange rumors surround the artist who created these solemn metal guard dogs.

Brass plaques embedded in pavement preserve the memories of those who lost their lives at the hands of Nazis during World War II.

A sculpture of the beloved author surrounded by characters from his fairy tales.