Although small, the redbrick fary-tale castle in Olszyn's centre takes on forbidding overtones as you approach the walls. I wouldn't want to attack the place that's for sure. The walls are high and the over-hanging battlements are an imposing sight indeed.
The castle was home to Nicolas Copernicus, the astronomer who discovered that the earth revolves around the sun, in the 16th Century and he actually commanded the Polish garrison tere during two siege attempts by the German Teutonic Knights. Some of his original astronomical measurements can still be seen on a wall inside the main keep as can his private toilet.
The keep itself houses a museum and art gallery featuring portrates of various noble personages from the past, antique furniture and, upstairs, various temprary exhibitions and displays.
There is a cafe, souveneer shop and in high season the tower is also open to visitors.
Only five minutes walk from the market square, the castle is Olsztyn's premier landmark and a must see for anyone passing through.