Spis Castle and Levoca are probably Slovakia's finest and most impressive tourist attractions. Levoca is a very pretty town with a large main square featuring several very interesting buildings, including the large Church of St. James with the altar by Master Paul. The town is surrounded by well-preserved walls. Spis Castle, or Spissky Hrad, is a fascinating and very large castle about a 25-minute drive from Levoca, partly in ruins but still an impressive sight. It is set on a steep hill and overlooks the surrounding area for many kilometres around. The castle consists of several courtyards and distinct buildings, but you have to watch your step on the slippery walkways. Very close to the castle is Spisska Kapitula, a Gothic cathedral in a religious complex that is definitely worth adding to your visit. The WH site also includes the town of Spisske Podhradie (between the castle and the cathedral) and the church in Zehra (about 3 km away). I saw both of them from a bus, but I don't think they would add a lot to the experience. The castle, the cathedral, and the town of Levoca make this a great site.