Shameless plug (who would have thought):
I've played hide and seek in Albania and used a bunker as a hideout. AMA :D
That's one of the few experiences I remember when I was 3-5yo.
Another Albanian thing worth mentioning is an extensive list of oil wells dispersed across residential areas see [0].
Family legend has it that my father almost drowned in one [1] when he was a kid, and a relative had to pull him by his nose to save him.