(They change quite often the schedule, please check before go. in June 2023: Open only on Wednesday morning 9.00-13.00 and Saturday afternoon 14.00-19.30) Don’t miss it, is somehow abandoned, but amazing!
Euryalus Fortress (the name comes from a Greek word, eyryélos, which means "shaped like a nail") of Syracuse is the largest castle dating back to Greek times that survives until the present day and one of the most important Greek monuments in Sicily. The Fort was built by Dionysius the Elder in six years, between 402 and 397 B.C., a time during which Syracuse was preparing for the inevitable clash with the Carthaginians for control of eastern Sicily. You will get lost in the excavated tunnels underground and immagine yourself in the ancient greek time. The view is of the area is great (from here is visible half Sicily, including Etna and Italy)