Madain Saleh is an old city in Saudi-Arabia. It is a sister city of Petra, built by the Nabateans more than 2000 years ago. It is located about 400 kilometres to the north-west of Medina and 500 kilometres to the south of Petra.
Madain Saleh, Saudi Arabia Dating back to the second century BC, the Nabataean archaeological site, also known as Madain Saleh, has long been hidden from foreign visitors in this ultra-conservative kingdom that rarely opens up to tourists. But now the largest and best preserved site of the Nabataean civilisation south of Petra in Jordan is the first Saudi archaeological site to be inscribed on UNESCO’s World Heritage List Archaeology in the News | The ASOR Blog
"Saudi Arabia: Opening up long hidden ancient ruins-Dating back to the second century BC, the Nabataean archaeological site, also known as Madain Saleh, has long been hidden from foreign visitors to Saudi Arabia...Madain Saleh, though likely one of Saudi's most famous archaeological sites, is not its only one. The area bears evidence of other ancient civilisations... It is home to archaeological remnants that date back thousands of years, including its citadel which is some 8000 years…
Mada'in Saleh is one of the best known archaeological sites in Saudi Arabia. It was once inhabited by the Nabataeans some 2000 years ago, Petra being the capital of the Nabataean kingdom. (Unesco World Heritage Site)