- Tough and stubborn. That's Amsterdam Castle Muiderslot, the oldest and best-preserved castle in the Netherlands. It is a magical place, surrounded by greenery and water. Built by Count Floris V in 1285, during its long history it has been used as a home, besieged and occupied, demolished, rebuilt and refurbished. This book tells the turbulent story of the finest Medieval castle in the Netherlands, now a lively placed enjoyed by many visitors.