The website restofworld got entries from 45 countries for a photo contest focusing on technology. Here are their top picks -- ...

Swim through seagrass meadows, explore ancient history and observe dugongs among coral reefs — an awe-inspiring world beneath ...

A brand new tunnel set to connect Denmark to Germany is underway. The 11-mile long passage is costing a huge $7.9 billion but ...

Built on a limestone foundation, Valletta housed defense systems in deep tunnels during WWII that saved Malta and Allied ...

The 17-mile underwater tunnel used by high-speed trains will be as deep as 1,558 feet below sea level, according to the ...

The Kingsway Exchange Tunnels were built in the 1940s to shelter Londoners from the Blitz bombing campaign during World War II. That was the last time they were open to the general public.