Although no Indian forts were destroyed by sudden disasters, there are several which were abandoned due to the ambitions of their rulers and have consequently deteriorated over time. Very few castles have survived unchanged since the early Middle Ages or even since the 14th-15th centuries: most of those built in the 10th-15th centuries were later rebuilt and altered. Castles were still used as living quarters until the 19th-20th centuries, and so were continually modified. Even now, some of them are private property.