Three bridges straddle a stream, one stacked upon the other.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

A subterranean playground in an abandoned slate mine.

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

An English artist has turned an unassuming ex-council house into a time-lost house of mystery.

To gaze upon the visage of Sri Lanka's biggest Buddha, one must first pass through the Tunnel of Hell.

This Sri Lankan cemetery is the final resting place of sci-fi legend Sir Arthur C. Clarke.

This luscious masterpiece created by landscape designer Bevis Bawa inspired the work of his brother, a famous Sri Lankan architect.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

This secret collection of the strange and occult was rediscovered in a forgotten room of an old house.

The world's largest collection of witchcraft regalia.