Is this one of the 77 Wonders of the World ? Yes, no, vote.
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“Qasr Kharana is one of the best-known of the desert castles. It is believed to have been built sometime before the early 8th century AD, based on a graffito in one of its upper rooms, despite visible Sassanid influences. A Greek or Byzantine house may have existed on the site. It is one of the earliest examples of Islamic architecture in the region.” More on Wikipedia.