It reminds me of a yurt, a mongolian tent, although it's obviously not made of cloth.
Not even sure if it's for habitition, probably not, looking at the low round fence/wall around it.
So what could it be than? A fountain that's not working or a memorial site?
I don't even know what search words to use, what shape do you call this?

Aaaah, so many questions, so little time