The Monastry at dusk - Petra / Jordan (by Phil Norton).

The red rock carved tombs of Petra / Jordan (by Terry White). 

Rock-carved stairs on the way to Petra / Jordan (by Bernard-G).

Al-Khazneh, The treasury of Petra / Jordan (by hebiflux).

The hidden gem, Petra / Jordan (by palnick).

Petra Monastery from inside a typical cave in the area, Jordan (by guillenperez).

Glimpse of the monastery in Petra, Jordan (by lordsheppy).

Early morning at The Treasury, Petra, Jordan (by www.garymcgovern.net).

The Nabatean tombs of Mada'in Saleh in Saudi Arabia (by AramcoBrats).

Entrance to the Treasury (Al Khazneh), a stunning piece of Nabataean architecture in Petra, Jordan (by IANLAYZELLUK).

The rock carved tombs of Mada'in Saleh in Saudi Arabia (by Eric Lafforgue).

The Monastery (Al Dier) in Petra, Jordan (by archer10).

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Glimpse of an ancient wonder, Petra, Jordan (by moro).

photo by Ivanilluuu on Flickr.

The lost city of Petra in Jordan. UNESCO has described it as "one of the most precious cultural properties of man's cultural heritage".