This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

The largest hewn stone in history.

The maze-like transportation hub contains abandoned areas, derelict stores, and a resident bat colony.

This museum in the famously blue neighborhood of Sidi Bou Saïd showcases a traditional Tunisian lifestyle.

An ancient burial ground believed to have been used for ritual sacrifice.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

Some believe this abandoned Brutalist masterpiece inspired George Lucas's Sandcrawler.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

A 14th-century Serbian Orthodox church that was once converted into a mosque under the much-disfavored Ottoman Empire.

This lonely minaret with an unusual decorative symbol is all that remains of a historic Ottoman mosque.

As of 2022, the 124 rooms of Kosovo ski resort remain empty.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

The oldest surviving “eel, pie, and mash” shop in London is renowned for its infamous jellied eels.

The world's largest collection of ship figureheads includes figures from legends and history alike, from Sir Lancelot to Abraham Lincoln.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

A wonderfully eclectic Victorian aquarium lies in the basement of the Horniman Museum.

Unlike other abandoned asylums this empty institution welcomes visitors, just don't go in the buildings.

This stone tower was built to protect Crete from incoming pirates.

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

Built on a medieval synagogue, this church has a burial crypt, tunnel system, and Jewish ritual bath hiding deep underneath.

Italian cave with exceptional acoustics and an unsavory history.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.