Baths of Caracalla

Tabula Lusoria - A Roman board game carved into the floor of the baths. This one was known as 'tropa' or "hole-game" played with marbles, walnuts or knucklebones. The game involved getting a walnut into each of the hollows, in a predetermined order, then getting the last one over the line.
There are some letters carved on this board which may read NESCIS/PLORAS/AGIS/CAVEBIS which translates as "You do not know, you cry, you move, you will be careful".
In the Baths of Caracalla, Rome.