Is this one of the 77 Wonders of the World ? Yes, no, vote.
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“Ad Deir (“The Monastery”), also known as El Deir, is a monumental building carved out of rock in the ancient Jordanian city of Petra. Built by the Nabataeans in the 1st century and measuring 50 meters wide by approximately 45 meters high, architecturally the Monastery is an example of the Nabatean Classical style. It is the second most visited building in Petra after Al Khazneh.” More on Wikipedia.