Nynäs Castle

Nynäs Castle’s main building incorporates structural elements spanning several centuries, creating a layered historical environment. The cellar sections, possibly originating from the 16th century, suggest a stone house around 16 by 18 meters with two to three levels beneath a traditional gabled roof featuring stepped gables. This foundation anchors the subsequent phases of construction.

The dominant part of the manor house visible today was established in the late 1600s by the Gyllenstierna family. Its design includes a roof crowned by a tympanum—a triangular decorative element resembling those seen on classical temples—and a centrally placed lantern. Two towers occupy the building’s corners, contributing to the structure’s imposing silhouette. These architectural aspects are documented in maps and sketches produced in 1663 and 1685, providing detailed historical references.

Inside, the manor holds remarkable features such as stucco ceilings likely crafted by Italian artist Carlo Carove. These ornate plaster decorations from the late 17th century appear in the grandest rooms, with monograms of Conrad Gyllenstierna and Eva Lewenhaupt integrated into the dining and bedroom ceilings. The interior reflects multiple stylistic periods: the Baroque style of the late 1600s, the Gustavian aesthetic from the late 1700s, and a Neo-Rococo influence introduced in the mid-1800s by Johan August Gripenstedt. Richly adorned salons and varied textile colors showcase this progression of interior design.

The manor’s floors were arranged purposefully: the ground level housed service areas including the kitchen and weaving room; the middle floor served as the principal floor for receiving guests and conducting affairs; the upper floor, fully furnished only in the early 19th century, accommodated visitors and guests.

Surrounding the manor once stood a moat, which was present until the late 1700s. The earliest gardens appeared just north of the main building, growing more elaborate in the early 1800s when large-scale landscaping transformed the area. This included the removal of a substantial rock to create a park featuring hedges, water elements, winding paths, flower beds, and a pavilion atop Mummerberget hill, enhancing the estate’s recreational spaces.

Additional estate structures near the castle served various agricultural and industrial purposes. These include a distillery located by Rundbosjön lake, a mill with documented operation from 1509 until 1972, a smithy, smokehouse, former dairy now repurposed as a residence, pigsty, carpenter’s workshop, and a powder magazine for storing gunpowder or other explosives. Together, these auxiliary buildings illustrate the estate’s diverse operations across centuries.

The landscapes around Nynäs include a protected nature reserve established in 1971, covering roughly 3,830 hectares, although the castle grounds are managed separately from the reserve. The Sörmlandsleden hiking trail runs close to the manor, weaving through the surrounding natural environment.