Petra is one of the world’s most mysterious ancient cities with the Al Khazneh building at its entrance an engineering masterpiece unrivalled in the ancient world. Learn how it was built nearly 2,000 years ago.
The most impressive monument to Muslim engineering in the Western world the Alhambra towers over...
(01:01)Dominating the skyline of Granada in Southern Spain, The Alhambra is an architectural wonder...
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