Nynäs Castle, Castle in Tystberga, Sweden

Nynäs Castle stands by Rundbosjön between Trosa and Nyköping. Its main building was begun in the 1650s for Erik Karlsson Gyllenstierna and completed by 1685, with a säteri roof, a pedimented fronton, a central lantern and two corner towers. The 1907 Orangery, designed by Isak Gustaf Clason, stands in the park.

The estate was first mentioned in 1328 when knight Peder Ragvaldson lived there. Over the centuries, the property developed into an important aristocratic residence in Sweden.

The castle displays rooms from different periods that reveal how Swedish aristocratic families lived from the 17th to early 20th century. Visitors can see the original furnishings and objects that were part of daily life.

Visitors can take guided tours of the castle and use the restaurant in the Orangery building. Marked walking paths lead through the nature areas and allow exploration of the whole property.

The medieval estate name Nyanes, recorded in 1328, likely refers to a new headland raised from the Baltic by land uplift. Parts of the cellar in the present main building may date from the 16th century, when a stone house about 16 by 18 metres stood here.