In the hills up from the seashore near Rome is this sanctuary, located in the resort town of Santa Marinella. It's not worth a trip, but I've been there three times to pray.
Notice the bottom photo, though. This is the view of the sea, covered by mist and rain. Can you see the little hill near the middle? That is what an old Etruscan tomb looks like. If excavations were to be done a giant room with tombs would very likely be discovered inside the middle. Hundreds of similar tombs are located all along the coast north of Rome.