Visitors to Häringe were greeted by Häringe Castle after 1657, although the present exterior is a product of the 1770s. Both Gustav Vasa and Gustav II Adolf are former owners of the estate. A more recent owner was businessman/industrialist, Axel Wenner-Gren. The oval room in the sea wing was furnished for Greta Garbo, a regular guest of the Wenner-Grens. Today, the estate is a conference centre and open to the general public.
Hammersta is the site of the ruins of an old fortress from the middle of the 15th century. Hammersta was a manor during the Middle Ages. Hammersta gård, by the manor, is from 1914.