Location:

It is located in Petra, Jordan, near to Wadi Musa.

Who built it:

It dates back to about 70 AD, this may have been the tomb of Malchus II who died at that time. A rare inscription inside one of the rooms indicates that it was converted into a church in 447 AD by Bishop Jason.

Explanation:
The Urn Tomb was one of the Royal Tombs of Petra. It had two layers of vaults and is thought to be the tomb of the Nabatean king, Malchus II. It was converted into a church by the Byzantines. They flattened the floor of the tomb and put in an altar.