A musical instrument played by the sea.

This Scandinavian island is the site of the first modern observatory.

A spitting ode to a German serial killer.

One of the oldest wine cellars in Germany is now a restaurant beneath Bremen's town hall.

The only remaining U-boat that is still floating never actually saw any action in World War II.

This red light district plaza memorializes the Fab Four and their historic connection to the area.

Hamburgers are intensely proud of their tunnel beneath the river.

Model Trains and Much More in Hamburg.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

This dockworkers' lunch joint has been left leaning by a century of storm floods.

This may be the smallest length of railway in the United Kingdom.

This nondescript building was the birthplace of Morris cars.

A medieval quay that was the Mayflower's final port of call before sailing for America.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

An unassuming rod in the Netherlands was once the old standard unit of length for the entire Dutch empire.

Only a few walls remain of the last church the Pilgrims used before they sailed to North America.

Science meets wall art to highlight the beauty of famous mathematical equations.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

One of the great math minds of the 17th century is underfoot in this 900 year old Dutch church.

People have been placing babies on these lilies for photoshoots since the Victorian era.

A 'living museum' in Leiden, the oldest of its kind in the Netherlands.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

The world’s first interactive human body museum also serves as a chair for a giant orange man.

This century-old street sign is a forgotten remnant of the old city.