Ancient — 2 museum-grade prints that set the mood. Petra was the capital of the Nabataean kingdom from roughly the fourth century BCE, a caravan city carved into rose-red sandstone cliffs in southern Jordan. Al-Khazneh — the Treasury — is the most photographed facade, though scholars debate whether it served as a royal tomb or temple. Angkor Archaeological Park spans more than four hundred square kilometres of Khmer Empire ruins outside Siem Reap — Angkor Wat remains the world's largest religious monument and appears on Cambodia's national flag. Ta Prohm is famous for silk-cotton trees whose roots embrace temple walls; Bayon in Angkor Thom carries dozens of serene stone faces; Apsara dancers appear throughout Khmer bas-relief tradition as celestial performers carved into sandstone galleries.