Previously the longest road tunnel in the world, the Gotthard Base Tunnel in Switzerland has slipped down the ranking as new ...

One idea to prevent another hurricane catastrophe in Houston is massive underground tunnels to redirect storm water. New reporting reveals Elon Musk's Boring Company has been involved in the planning.

Everyone visiting American cities spends their days looking up at high-rises or strolling through street-level delights. That makes sense—the world above knows how to get noticed. But below the ...