A popular 19th-century natural landmark is now hidden within a sprawling forest.

A network of concealed passageways lies within a busy London Underground station.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

Ever hear of the Milazzo Cage?

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

One of two lighted lanterns hung in the church belfry on the eve of the Revolutionary War to warn that the British were on their way.

A century-old network of freight tunnels underneath the city's historic business district.

A cave dug by a man directed by ghosts to find pirate treasure.