During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.

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

This fountain was designed to honor the man who helped bring water to Barcelona.

Rubbing the buttons along this statue's coat is considered good luck.

The door to the museum holds a unique artifact from the Finnish Civil War.

In the waters outside Helsinki, a tiny island once used as a military outpost now welcomes visitors.

Atop this library is one of the most beautiful green spaces in Warsaw.

Massive galleon from a box-office bomb docked in Genoa.

Once home to one of the oldest banks in the world, this building is also where Marco Polo's famous travelogue was written.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

Genoa's collection of over 4 million zoological, botanical, and geological specimens from around the world.

A medieval military street hidden beneath a charming French fishing village.

Auguste Maïcon, a pioneer in French aviation, was born in this house in 1891.

A reconstruction of a classic mansion on the island of Delos was designed for a historian and archaeologist.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

This massive blockhead sculpture hides an entire library.

The construction of a tram line unveiled hidden remnants of the old medieval city.

Artist's eccentric property excessively decorated with found objects and work of his own.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

Haunting monument to the German Jewish philosopher who died while fleeing fascism.

The unexpectedly beloved remnants of a controversial thermal power plant.

A bookstore dedicated to the intersection of comedy and art.