The pretty iron lamp is a reminder of the architecture underneath London's streets.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

Copenhagen's celebrated theme park and gardens.

The only surviving piece of Copenhagen's 16th-century defensive wall.

Site of the first radio and telephone broadcasting companies in Copenhagen.

This ordinary street was made infamous by a legendary visit from the devil.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

This pair of gilded girls atop an Art Deco building in Copenhagen were built to function as a weather indicator.

One of Scandinavia's largest mosaics pays tribute to Danish art and science luminaries.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

Legendary site where an evil bishop was devoured by rodents.

This marvelous array is one of the largest collections of mechanical instruments in Europe.

Tiny castle in the middle of the Rhine made you pay to pass.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

Life-sized bronze statues of fictional puppet characters.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

The bones of the Biblical Magi traveled to Constantinople and Milan before landing in their current home inside an elaborate golden reliquary in the Cologne Cathedral.

Art historians have debated the identity of this medieval stone rider since the 19th century.

An ode to a soldier who came to town, fell in love, then began making his own sparkling wine.

A sculpture of a beloved local figure, who tipped his top hat to everyone he passed on the streets of Bratislava.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.