Seen from above, Sukari gold mine in southeastern Egypt looks like a massive chasm with terraced sides. A rock formation looms next to the pit, and toy-sized machines move around inside it. The view ...

The marina, set to cost $140 billion, is part of the Line, a 110-mile-long "vertical city" being built in the Saudi desert.

Yulius Yogi kneels under the forest canopy here on the island of Borneo, surveying land he plans to reclaim for his Dayak ...