I recently found myself descending what looked like subway stairs into a dark underground parking garage. All alone, on the Portuguese island of São Miguel, in the city of Ponta Delgada—if you can ...

The National Mall Coalition's main design proposes an underground facility with a visitors center and car parking on the top floor, bus parking, which would be vacated during flooding, on the second ...

The heat held in New York's underground labyrinth of infrastructure, from hundreds of miles of subway tunnels to parking garages and malls, is a clean energy gold mine. Now, a Swiss startup wants to ...