A tower-house or donjon which dates back to the 14th century. It was built by Reinier Dever, a knight and vassel of Albrecht van Benieren, count of Holland, Zeeland en Henegouwen. In the 16th century a small extension was built de round side. This was later enlaarged and Dever became a country mansion The mediaeval tower was hidden out of sight at the back. People lived hre till the 1750's after which it stood abandoned for almost a century. Then in 1848 the 16th century extension collapsed and over the nexst 5 to 10 years all but the tower was demolished by anyone needing building materials. The tower lost its roof during a storm in 1862, but the walls withstoo all atempts at destruction by man and nature. By the time restoratino began in 1973 all timber had gone, windows and doorways eroded with grass and bushwood growing on the walls. The house has been open to the public since 1978. The foundations of the 16th and 17th centuray extensions were raised just above the ground levevl to show the groundplan of the complex.