Italy's Sforza Castle includes a underground passage that linked the Duke of Milan to his wife’s tomb.

Deep in the heart of Paris, a series of underground ... Finding an unlocked entrance can be an exceptionally long trek from the nearest subway, and knowing the secret entrances can require ...

A SECRET 1,000ft smuggling tunnel has been discovered under the US-Mexico border by officials who were examining a storm ...

Princess Anne, 74, made a surprising comment about her home life on Tuesday, speaking about her horses on her Gatcombe Park ...

The authorities have so far been unable to locate the entrance to the bunker so they ... is believed to be hiding from police in a secret underground bunker. Drilling equipment has been brought ...

Beach was describing the components necessary to move people from point A to point B by putting them in underground tubes ... Alfred Ely Beach revealed his secret to a dumbfounded public.

Hiding behind secret doors and bookshelves, using puzzles and passwords to help patrons find the entrance, or even ...

General Jose Lemus, commander of Ciudad Juarez's military garrison, said the tunnel "must have taken a long time" to build, ...

There is a lot going on under our feet, and those holes in the ground are just one entrance to this underground world and one clue to figure out what animals are moving around underneath us. Audubon ...