Petra, Jordan's archaeological jewel and one of the New Seven Wonders of the Modern World, is a monumental city carved directly into the pink sandstone cliffs of the desert. For centuries it was the prosperous capital of the Nabataean kingdom, a caravan crossroads connecting Arabia, Egypt and Syria. Today, walking through its narrow Siq canyon to behold the iconic Treasury (Al-Khazneh) is one of the most breathtaking travel experiences on the planet. The vast archaeological site encompasses temples, tombs, a Roman theatre and the imposing Monastery (Ad-Deir), all set in a desert landscape of overwhelming beauty.