Introduction to Castle Hill: Castle Hill was the fortress of an ancient Greek city and the first medieval city. It was the place chosen by the Greek Phocaeans to build a trading house thousands of years ago, and the city of Nice was built as a result. Today, only a few walls of the Castle Hill remain, but in this botanical garden that doubles as a park, people can enjoy unique views of Nice and its surroundings, an amazing artificial waterfall, the remains of a former cathedral built in the 11th century, mosaics Ground etc.