Castles were magnificantly built for the housing of knights, warriors and defenders. They were beautifully constructed in many shapes and sizes.
The Normans had a city surrounding a large hill. The castle was built on top of the hill for better accuracy in defending the area from the English.
The Deal Castle was built in less than 2 years (1539-1540) to defend the English coast. It resembles a flower with 6 bastions around the keep. With luck the gunners could hit ships up to 3 miles away! In it's gun powder storehouse, candle lanterns were set behind glass windows to lessen the risk of accidental explosions.