St. Andrew's Castle is located on the island with the same name, but the locals often call it, Red Island. The castle has changed its functions over time. It was primarily a monastery and ended up as the summer residence of the famous Hutterott family at that time.
The historical sights are extremely well preserved, and in addition to them, the fact that there are more than 180 different species of plants brought from all over the world is interesting. Today, the island offers hotel accommodation with a handful of facilities and is 10-15 minutes away from the city by a small ferry.