One of the finest surviving Irish tower houses, with 17th-century cannonball scars still lodged in the wall above the entrance.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

More than fifty centuries-old religious shrines hide in the walls and above the doorways of Gozo’s capital, and most visitors walk straight past them.

This rock and roll institution decided to include some local signage of nearby extinct shops.

A 1600-year-old church carved into the rock, with painted frescoes from 900.

This is Bremen’s oldest historic district, famous for its labyrinth of narrow medieval alleys lined with tiny, colorful 15th-century houses that resemble beads on a rope.

Luxembourg's most popular statue since 1923 has been missing for... 26 years!

A discreet mark on the ground marking the site of the first chapel of the Glacis, dedicated to the patron saint of the city of Luxembourg and the country

Gustave Eiffel's masterpiece until the Eiffel Tower was built.

This Cardiff Bay landmark traces its history back to when Norwegian ships transported coal from Wales.

Across Valencia lie the remains of three ancient fortifications built centuries apart: a Roman enclosure, an Islamic expansion, and a medieval Christian wall.

An ancient monastery, a locked room, and a mysterious book heist.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

This work of engineering is imbued with elegance and ingeniousness.

A carved figure embodying the palace’s pint-sized but protective spirit rooted in local folklore.

This 12th-century castle majestically overlooks the city and the beautiful Mosel River valley.

A monumental golden thumb rises as an iconic homage to Nouveau Réalisme, bold in scale and unapologetic in spirit.

This 18th century mansion played Winterfell in Game of Thrones.

Rainbow arches made of shipping containers grace the entrance to one of France's largest seaports.

The oldest floral clock in the world still functions today.

This seemingly humble work of art—a block of limestone—conceals a daring story and an artistic tour de force.

An ancient healing font dedicated to an 11th-century matriarch was moved to make way for progress.

This 19th-century fountain features sculptures of little gnomes that help with chores.

This unfinished sculpture, once loathed by locals, ultimately earned their affection.