Researchers may have found the hidden tunnels beneath a castle in Milan that Leonardo da Vinci sketched in 1495.

Today, L.A. Metro’s subway tunnels connect some of the city’s most densely populated neighborhoods. There are many other ...

A pair of Derbyshire urban explorers have shone fresh light on a concealed part of the county’s industrial heritage after an ...

A heritage project has uncovered the hidden history beneath Brighton railway station, revealing underground tunnels and secret rooms.

It's been almost 50 days since a water conservation order was sent out to residents in Weirton on Dec. 18.Now, after several ...

When it comes to replacing the Tobin Bridge, Boston.com readers think sinking the whole shebang under the Mystic River is the ...

Video obtained by ABC-7 from content creator Luis Chaparro shows a border wall gate opening and a group of people crossing ...

An underground tunnel network long rumored thanks to drawings by Leonardo ... but inaccessible, spaces, bringing to light ...

Metrolinx will extend the Hazel McCallion light rail line into downtown Brampton, with a four-kilometre underground tunnel.

What the visiting journalists weren’t told—nor were many of the soldiers living at the station, which could house up to ...