Many such rocks have been found in this area, known as the Larian Triangle. They were hollowed out to form troughs; historians have recently discovered that they were used as individual or communal tombs, not in prehistoric times, but after the fall of the Roman Empire. In subsequent centuries they were reused in buildings and as basins for springs and fountains. The rock at Bicogno, which dates back to the 6th century AD, was also once a tomb (note the stone pillow). It was covered by a stone slab, which has been lost. From the road there is a lovely view towards the mountains and the lake.