Petra, meaning rock, is a historic and archaeological city in the Jordanian governorate of Ma'an, that has rock cut architecture and water conduits system. It was established sometime around the 6th century BC as the capital city of the Nabataean., It is a symbol of Jordan as well as it's most visited tourism attraction. Petra was chosen by the BBC as one of "the 10 places you have to see before you die".
The best place to visit while you are here is Al Khazneh. Al Khazneh is also known as "The Treasury" and is one of the most elaborate builings in Petra. This structure was carved out of sandstone rock face and is a very popular tourist attraction.