At the centre of the cascade is an artificial grotto with two stories, faced inside and out with hewn brown stone. It currently contains a modest museum of the fountains' history. One of the exhibits is a table carrying a bowl of (artificial) fruit, a replica of a similar table built under Peter's direction. The table is rigged with jets of water that soak visitors when they reach for the fruit, a feature from Mannerist gardens that remained popular in Germany. The grotto is connected to the palace above and behind by a hidden corridor.