Fort by Rhijnauwen was built between 1868 and 1875 as part of the New Dutch Water Defence Line. Because of its architectural style and good state of preservation, the fort is historically unique. But it's also of great value as a nature reserve. It was closed to the general public for years and became a paradise for many endangered plants and animals. There are also weasels, foxes, roe, grass snakes and many varieties of butterflies. In winter, hundreds of bats hibernate in the fort. The fort consists of bombproof shelters, powder magazines, barracks, flank defences, group shelters and a large practice and parade square. Surrounding the complex is a double moat. Today, the fort can be visited on a guided tour.