Nowhere to sit? Not a Park.
No vegetation of any kind? Not a park.
There is room for different kinds of spaces, but no one can reasonable accept a space whose only purpose is to be seen/read is a park.
It might be history, it might be a memorial and it might be art; but it can not be a park.
park
pärk/
noun
noun:
park; plural noun:
parks
1.
a large public green area in a town, used for recreation.
"a walk around the park"
synonyms: playground, play area, public garden, garden(s), green
"we were playing in the park"
- US
a large area of land kept in its natural state for public recreational use.