The white turreted château that gives Nyon its skyline. The earliest fortifications on the hill date from the 12th century; the building took its present form under the Bernese in the 16th and 17th centuries, when Nyon was a Bernese bailliage. The castle is in two parts: a public museum on the lower floors covers the history of the town, including its famous porcelain manufactures, and the upper floors house the still-active office of the Vaud cantonal government.
The terrace behind the castle is one of the best free viewpoints on the lake — out over the harbour, the water, and on a clear day, Mont Blanc directly opposite. The museum is closed Mondays and on the first day of each month. Allow about ninety minutes for the visit including the terrace.