The silly symbol for an underground protest group is now scattered around the city.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

The intricate geometry inside this Baroque-style dome was designed to create "terror of the human soul."

Depending on how it is measured, this lighthouse can claim to be the tallest in Europe and the tallest conventional lighthouse in the world.

One of the earliest depictions of an Arthurian scene that is shrouded in mystery.

This Renaissance palace features a unique architectural design and is now home to the Ferrara National Art Gallery.

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

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

Southern Italy's spinning top village.

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

Wander through the Corridor of Wonders in these stunning limestone caverns.

If you visit Santa's village, you can get your passport stamped to show you crossed into the Arctic Circle.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

These mechanical goats first battled it out in the year 1551, all because of an overcooked deer.

This one-time health resort was used by aristocrats around the world.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

The facade of this 16th-century building is decorated with carvings of 300 seashells.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.