A kilometre or so northeast of Stromboli village, the basalt sea stack of Strombolicchio rises out of the water with a small lighthouse balanced on top. It is one of the oldest exposed pieces of the entire Aeolian volcanic complex, the eroded core of a former crater. Sea birds nest on the lower ledges; the water around the base is deep and clear.
Most boat trips circling Stromboli swing past Strombolicchio on the way. Swimming and snorkelling near the rock are excellent if the sea is calm. Climbing the steps to the lighthouse is officially closed but occasionally allowed by tour operators with permits.