Entry to the New Fortress starts near a market that once was a dry moat for the castle. You then proceed up this Castello della Campana. The bastion here was built in 1580 and reaches a height of 180 feet. You proceed through a tunnel and stairs until you reach the upper level. The buildings are mostly empty but you can walk inside them. The best part of walking to the top of San Marco or New Castle is the superb view the town and bay.