Petra is a famous archaeological site located in the desert of southwestern Jordan. The Nabataean capital dating from around 300 BC, accessible only through a narrow canyon called Al Siq, was an important trade transit city linking the silk, spice and other commodity routes, connecting China , India and Arabia, with Egypt, Syria, Greece and Rome. It is nicknamed the "Pink City" because it sits in a valley with tombs, temples and monuments carved into the surrounding pink sandstone cliffs. The most famous construction is probably Al Khazneh (also known as The Treasury), a 45-meter-high temple with an ornate Greek-style façade.A UNESCO World Heritage Site, it is the national icon of Jordan and one of the 7 wonders of the modern world.