(Slotlaan 3), formerly known as Horst op de Berg, is a moated castle with six-sided corner towers. This castle, first mentioned in 1301, was probably created from a 13th-century square residential tower, with some wallwork still visible on the south side.
In 1566 the castle came to Herman van Zuylen and in 1579 it became the property of Godard van Reede to Saesfeld, lord of Amerongen and Zuylenstein. His grandson Godard was responsible for the construction of the Reevaart and around 1635 he had the castle raised by a floor and the courtyard overbuild. French troops set fire to the castle in 1672. After the restoration it was in 1695 to Godard Willem van Tuyll of Serooskerken. This left around 1700 the current entrance with a semicircular dormer window, as well as the monumental bridge with the high staircase (beletage) and also a service entrance (basement). Banker John Hope was the owner from 1774 to 1803. After a devastating fire in 1971, where only bare walls remained, the castle was rebuilt in 1973 and served for a long time as the Toonderstudio's. In the second quarter of the 18th century Godard William's son renewed the garden and built a forecourt with two building houses. Only the southern building house (Slotlaan 4) remains.
The park and the driveway are accessible via a wrought iron entrance gate (circa 1730) between stone pillars in Louis XIV style.
