Petra

Petra originally known to its inhabitants as Raqmu, is a historical and archaeological city in southern Jordan. Petra lies on the slope of Jabal Al-Madbah in a basin among the mountains which form the eastern flank of Arabah valley that run from the Dead Sea to the Gulf of Aqaba. Petra is believed to have been settled as early as 9,000 BC, and it was possibly established in the 4th century BC as the capital city of the Nabataean Kingdom. Petra flourished in the 1st century AD when its famous Khazneh structure believed to be the mausoleum of Nabataean King Aretas IV was constructed, and its population peaked at an estimated 20,000 inhabitants. Although the Nabataean Kingdom became a client state for the Roman Empire in the first century BC, it was only in 106 AD that they lost their independence. Petra fell to the Romans who annexed and renamed Nabataea to Arabia Petraea. The Byzantine Era witnessed the construction of several Christian churches, but the city continued to decline, and by the early Islamic era became an abandoned place where only a handful of nomads lived. It remained unknown to the world until it was rediscovered in 1812 by Johann Ludwig Burckhardt. The city is accessed through a 1.2 kilometres (0.75 mi) long gorge called the Siq, which leads directly to the Khazneh. Famous for its rock-cut architecture and water conduit system, Petra is also called the Rose City due to the color of the stone out of which it is carved. It has been a UNESCO World Heritage Site since 1985. UNESCO has described it as "one of the most precious cultural properties of man's cultural heritage". In 2007, Al-Khazneh was voted in as one of the New7Wonders of the World. Petra is a symbol of Jordan, as well as Jordan's most-visited tourist attraction. Tourist numbers peaked at 1 million in 2010, the following period witnessed a slump due to regional instability. However, tourist numbers have picked up recently, and around 600,000 tourists visited the site in 2017.