The farm is surrounded by gravefields from the younger Iron Age and Gullhamra farmstead. They were two farmsteads separated by a little stream. Both the farmsteads and the gravefields came from the younger Iron Age in their beginning. Even older in their origin are the two ancient castles (hillforts) that lie close by. One of them (R78) is very well preserved. They were probably built during the older Iron Age but were used in the younger Iron Age too. The first written records about Karshamra come from the 12th century. It was a small farm and it was called Karlshambra. It means the hill where Karl lives. Hambra or Hamra is an old Swedish word for a hill. In the year 1652 the farm is bought by the powerful Schering Rosenhane. Two years later Karshamra became a Manor. Rosenhane owned 8 Manors so he never actually lived at Karshamra but he built a nice Manor house. After Rosenhanes death in 1675 his widow sold Karshamra to Zacharias Wattrang. He owned most of the land in Grödinge at the time. He lived at Marieberg, a Manor that was situated on a hill on the other side of the valley. In the 1930,s the last houses were torn down at Gullhamra. Fruit trees and some groundings made of stone is all that can be seen of Gullhamra today. Since Karshamra was bought by Marieberg nothing spectacular was built there. The house that can be seen today is built around 1815, a main building with two wings. The main building has a hipped roof and is built on an old ground. It is privately owned.