Wadi Musa (altitude 1000 meters) is the name of the town you stay in to visit Petra (Indiana Jones and the Last Crusade). The best way to get here from Amman is by Jett Bus, it takes 3.5 hrs and costs JD10. The bus leaves Amman at 0630 from the Jett Bus Office in Abdali, it does not leave from the Abdali Bus station. You can reserve a ticket online or by phone and then pay for it when you arrive to catch the bus, you cannot buy the ticket online. The bus has comfortable seats and is air-conditioned but not much leg room, it was only half full. Its worth noting that the bus does not stop at the Wadi Musa Bus station, it keeps going and only stops in the Parking area at the entrance to the Petra site about 2km further on. From there you have to get a taxi to your hotel, cost not more than JD2. The same bus returns to Amman at 1700, so you can visit Petra from Amman and return the same day.
Petra (entry JD50 0r USD$70), established around 300 BC and abandoned in 106 AD. It was the Capital city of the Nabataeans and is Jordan’s most visited tourist attraction.
Go early (0730), the tour busses start turning up at 1000 and it gets packed. Be prepared to walk at least 6-20 km depending on how far you want to go, the interesting bit is the narrow gorge to the iconic Treasury after that it opens up and you get to the Roman theatre and some tombs, about 4 km and then another 4 km to get back to the entrance, that’s as far as I got.