In the early 1800s, a Swiss explorer tricked his way into Petra, the ancient oasis whose location had been a closely guarded secret for centuries. Known as Ed Deir—the Monastery—this building ...

In 2016, satellite imaging and drone surveys revealed a massive structure-about the size of two Olympic swimming pools placed side by side-submerged in sand half a mile south of Petra's city center.

About 2,000 years ago, the powerful ancient kingdom of the Nabataeans hand-carved a city into the sandstone cliffs of Petra, ...