13 historic monuments, puzzles which are still not solved

Petra, Jordan

Monumental “nest” at an altitude of 900 meters above sea level, hid in the rocks. Masters had showed remarkable patience, vytachivaya one beauty of Petra. So, at the end of the cool canyon Cid offers a fantastic view of the facade with columns and porticos – Al Khazneh (in Arabic – “Treasury”). Perhaps the temple, and perhaps a mausoleum. The problem with a lot of unknowns – to understand how the carvers worked. After all, without the scaffolding can not do, but they were nowhere to take.