The Grotta del Tono, located near the Gioiosa Marea railway station, is a very important geological and historical place for the town. This cavity is located at about 10 m above sea level and is divided into two main chambers from which several circular passages branch off. This karst type formation is made up of limestone rocks and boasts the presence of numerous stalactites and stalagmites. The first information on the cave dates back to the nineteenth century, but it was necessary to wait until the early eighties to be able to count real exploratory campaigns. During these surveys, finds from prehistoric times relating to the cults of Diana, Piano Conte and Piano Quartara were discovered, now preserved in the Paolo Orsi Museum in Syracuse.