As castles were built hundreds of years ago, most of them are ruins. Some are still lived in by wealthy families, or are still used by governments or armies. Because of this they might have changed and look different to old castles which were abandoned. Many castles have been turned into museums so the public can visit and learn about the past. Some castles are owned by the state, and others are owned by private people. Castles are expensive to run, so many are falling down. Every so often lightning strikes, flooding, or earthquakes damage castles.