A Scottish manor with a history of mysterious fires, magic, and eccentric tales

Legend says a witch conjured the world's third largest whirlpool to protect Scotland from a nasty pirate.

Underground monastery and fortress.

An ancient city exhumed from the depths of the ocean.

Nearly 2 billion seeds from 38,000 species are stored and processed at this visitable facility in a quiet corner of England.

An abandoned outdoor movie theater in the Sinai desert.

This isolated island is often capped by its own fluffy cloud.

This foolish Victorian sea fort was converted to a deluxe hotel.

This huge industrial sculpture looks like a UFO and a factory had a baby.

A sulfuric hellscape in southern Italy.

This mysterious and creepy location instills a strong sense of foreboding in all visitors.

This museum explores the grim reality of life in the earliest British colonies in America.

A curious collection of mechanical moving figures.

This ancient subterranean megalopolis is known for the hot oil traps that were installed above each of its entrances.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

The second largest in the world, this massive underground void has its own subway.

Folklore says this medieval fortress was plopped atop a portal to hell to trap the demons below.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

The world is full of swimming holes, but few compare to Samoa’s idyllic To Sua ocean trench.

This abandoned mining village was predicted to resist decay longer than any other modern human settlement.

The world's second-largest excavated hole.

Social outcasts and cannibalism in Stalin's Soviet Union.