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

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.

In 1977, an eccentric book lover formed a micronation for book lovers.

This unique prehistoric funerary monument is notable for its distinctive boat-shaped design and exceptional preservation, offering a fascinating glimpse into the island's ancient burial practices.

The final resting place of the great navigator, or maybe his brother.

A 16th-century Andalusian palace.

Spain's largest bullring offers a unique glimpse at architecture and history.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A hidden three-foot-wide house separates these two regal churches.

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

The world's most active stratovolcano is almost always erupting.

A triumphal steel arch on the side of a German mountain.

Hilltop monument to the victory of a new nation in the Franco-Prussian War.

At these downtown crossings, pedestrian lights show axe-wielding Vikings instead of the usual walking figures.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

This unique architectural wonder is home to luxury apartments.

Hidden in plain sight, the origin of these embedded skulls remains the stuff of legend.

When this Iron Age bog body was discovered in 1835, it was thought that she had died recently.

As can be expected from a centuries-old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

Go inside to really appreciate this 500-year-old technological masterpiece.

Two stone columns flank the grand Venice square, but there were supposed to be three.

One of the oldest libraries in the world is still operating and contains the oldest existing document in the Italian language.