The design of Deal Castle is quite striking as the curtain walls make it look like a Tudor rose. The designer is unknown and we don't know if it was a coincidence that it looked like the Tudor symbol. It was built quickly and, alongside the nearby castles Sandown and Walmer, became known as one of the Castles of the Downs. Deal is the biggest. They were supported by a bank of earthwork forts and a two and a half miles long defensive ditch.
The castle was reinforced further during Elizabeth's reign when the Spanish Armada threatened, and probably remained mobilised throughout her reign as she encouraged her navy to steal from Spanish ships, so who knew when the angry Spanish would turn up. Her reign was peaceful though and Deal Castle was allowed to fall into disrepair. Due to its position on the coast, the castle was battered by storms that caused a lot of damage to the stonework and the foundations.
However, the castle did get to see some action a hundred years later when the Parliamentary forces seized it during the first English Civil War. Like many of its Medieval counterparts, the castle took some damage but was fit enough for further service during the Napoleonic Wars. Following that it passed to private owners who made some adjustments make it it their home, and the castle's status became residential. It's potential death knell came during the Second World War when it was bombed by German forces.
Restorations started in the 1950s and focused on removing the domestic alterations so that Deal Castle looked like the military fort it once was. In the 21st century English Heritage acquired it and it is open to the public so the rooms and underground tunnels are available to all. The views over the fine sandy beach, with France in the distance, are well worth seeing.