https://www.zamek-ploskovice.cz

Ploskovice Chateau is a beautiful Baroque castle in northern Czechia — perfect for curious travelers who love a mix of history, architecture, and relaxed exploring.Once a summer residence for royalty, today it welcomes visitors into elegant rooms, surprising underground grottoes, and peaceful garden...

https://www.azay-le-rideau.fr

Originally, a fortress was built in medieval times. However, the castle of Azay-le-Rideau was built in 1510. Today, it is one of the famous castles of the Loire region and popular by many visitors. 

The castle of Friedrichstein hosts a museum that represents 900 years of history. The castle has been owned by different families, amongst others the princely house of Waldeck and Pyrmont.