The round old fortress is in good condition because it never saw any action as a fortress but it is worth a look as you do get views from the top over Leiden.
It sits on a man made hill but you might need a map or a local to find it as the hill is small - about 30 steps to the top.
It's free and in a nice part to town so take 20 minutes and explore it.
Own or manage this property? Claim your listing for free to respond to reviews, update your profile and much more.