請問這個圓形的建物是什麼？經實地觀察並未觀測到此建物。

Unable to answer "What’s the surface here?" – Foot Path – way/529159832 via StreetComplete 58.1:

There is no pathway.

"There is never been a park, this place is private."
The place has gone or never existed. A user of Organic Maps application has reported that the POI was visible on the map (see snapshot date below), but was not found on the ground.
OSM snapshot date: 2024-04-29T02:50:07Z
POI name: 民生公園
POI types: leisure-park
#organicmaps android

"臺南鎮安店"
OSM snapshot date: 2024-04-29T02:50:07Z
POI name: 全家便利商店
POI types: shop-convenience
#organicmaps android

"This shop has moved to no.394 on the same road."
The place has gone or never existed. A user of Organic Maps application has reported that the POI was visible on the map (see snapshot date below), but was not found on the ground.
OSM snapshot date: 2024-04-29T02:50:07Z
POI name: 全家便利商店
POI types: shop-convenience
#organicmaps android

"安南鎮園門市"
OSM snapshot date: 2024-04-29T02:50:07Z
POI name: 7-11
POI types: shop-convenience
#organicmaps android