The Notary House, formerly the Huygens’ Swaensteyn Museum, is the premier house for the history, art, and culture of Voorburg and Leidschendam. The museum is located on Herenstraat, one of the oldest buildings in the Huygens Quarter of Voorburg. The museum presents at least two temporary exhibitions per year. Additionally, it focuses on the Romans and Forum Hadriani and the remarkable life of Princess Marianne of Orange.