I The town started to decline during World War I when the diamond field slowly started to deplete. By the early 1920s, the area was in a severe decline. Hastening the town's demise was the discovery in 1928 of the richest diamond-bearing deposits ever known, on the beach terraces 270 kilometres (170 mi) south of Kolmanskop, near the Orange River. Many of the town's inhabitants joined the rush to the south, leaving their homes and possessions behind. The new diamond find merely required scouting the beaches as opposed to more difficult mining. The town was ultimately abandoned in 1956. The geological forces of the desert mean that tourists now walk through houses knee-deep in sand. Kolmanskop is popular with photographers for its settings of the desert sands reclaiming this once-thriving town, and the arid climate preserving the traditional Edwardian architecture in the area. Due to its location within the restricted area (Sperrgebiet) of the Namib desert, tourists need a permit to enter the town.