In AD 640 the Arabs took over the city and held it until AD 1101 were it was taken over by the crusaders. In 1261 King Louis IX of france took over the city, but lost the city to Mamluk sultan Beybars, who destroyed the city, and it was a ruin for more than 600 years.
In 1878 a group of refugees from bosnia moved in and was living there until 1948.
It is a great place if you have kids because the can run around, and there is plenty of space. the picture below is the ocean view from the place
There are plenty of oppotunities to find mosaic when you walk around.
Some more beautiful mosaic, that you can find many places around in caesarea
The following pictures are from the outer wall, that surrounds the "city"