Stenstuan is a Neolithic passage tomb situated on a hill in an agrarian landscape that was previously a wetland. The area between Gladsax and Baskemölla is a typical burial landscape, rich in ancient remains from different periods.

The tomb was built 5,500 years ago and then used over several generations. Most of the carvings were made in the Bronze Age, although some experts claim that several of the 90 cup marks at the top of the megalith may have been cut when the tomb was originally constructed, in which case 2,000 years would have passed between the first and the last cup mark was made. The motifs are few but varied. There are ships, axes, wheel crosses and a circle. One ship is carrying a representation of the sun, and another a hornblower. The circle is believed to be an arm ring. Several interesting finds were made when Stenstuan was excavated in 1978, most of them Neolithic in origin. One major find consisted of 4,000 potsherds discovered at the passage entrance. Others include amber beads – some of which were shaped like small clubs – charred clamshells and flint axe fragments. Hammerstones that may have been used for making the decoration in the roof slab were also found. Enter the site by turning off at Rosdala farm between Gladsax and Baskemölla and pass the buildings next to the road. Park in the designated area where there is an information sign. Continue to the passage tomb. From here you can see the next Neolithic tomb, Ekenäs, at the top of the hill. Both are included in a conservation programme funded by the County Council and are examined annually by the respective landowners in cooperation with Österlens museum.