Thousands of graves lurk below the surface of this park.

This historic fountain is a favorite neighborhood meeting point.

Locals perched on icy thrones brave frigid temperatures during this bizarre winter tradition.

This fantastical icy castle is built anew every winter.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

This copy of the famous Prague Astronomical Clock is the result of one man's passion project.

This church also serves as a lighthouse complete with a beacon.

This building contains a door only used by members of the royal family.

Inspired by Thomas Stothard's painting of the "Journey to Canterbury," albeit with Canterbury natives.

The first monument in Estonia that was made by an Estonian sculptor.

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

One of America's founding fathers lived in this London lodging between 1757 and 1775.

Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.

The site where two doves fell in love.

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

Celebrating the Swedish ship used in the first Arctic expedition to navigate through the Northeast Passage.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

A plaque on the side of a building is a small tribute to the woman who invented an iconic Berlin fast food.

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

Dedicated to the untimely death of American balloonist and parachutist.

There are hidden patterns on the subway seats of some Stockholm metro cars.

This former hospital was once one of the oldest mental health facilities in Europe.

This Art Nouveau gate still stands at the former entrance of a 20th-century Spanish writer's colony.

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