Come with me on a little adventure (all right, 18 minutes, but you won't regret it), in exploration of an abandoned Ligurian fort which has been towering above the hills of Genoa since the 19th century!
The holes in the ground are “murder holes” just like you might find in a medieval gatehouse fortification. You can imagine their use im sure, now that you know what they’re called. (Not counting the commodes you found shortly after. Those were in fact toilets lol )