The castle was built about 900 years ago and was kept growing for hundreds of years - new towers added, walls extended, new courtyards joined on. By the time it was finished it covered four hectares, which is about the size of six football pitches.
Even though it is a ruin now (the roof of the main palace fell in long ago), you can still walk all the way around the walls and into the rooms. The grass grows tall between the stones, and on a windy day you can hear the air whistle through the empty windows.
UNESCO has put Spiš Castle on its list of important places in the world that everyone should help protect. The ruin is so huge and so old that experts come from many countries to study how it was built.
From the top of the highest tower, you can see for miles - rolling green hills, little white villages with red roofs, and on a clear day the High Tatras far in the distance. It is a perfect spot to imagine what daily life was like for the people who once lived inside the walls.