Find a proper historic:civilization value. This is a Venetian castle. "Venetian" as a civilization seems wrong and the current "medieval_christianity" value seems to generic.

"Αποθήκες Ο.Σ.Ε."
POI has no name
POI types: building-train_station
OSM data version: 2020-07-14T11:22:37Z
#mapsme

"Κατηγορία : Δημοτικό Σχολείο
3ο Δημοτικό Σχολείο Χαλκίδας
Τζιαρντίνι 4-6 , 34100 Χαλκίδα
Τηλ.: 2221022943
e-mail : [email protected]"
POI name: 3ο Δημοτικό Σχολείο
POI types: building
OSM data version: 2022-03-31T16:41:57Z
#mapsme

"Αντί για παιδική χαρά τώρα πλέον είναι Πάρκο Σκύλων"
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: 2023-02-27T13:03:31Z
POI has no name
POI types: leisure-playground
#organicmaps

"Πύλη - Είσοδος του Κάστρου"
POI has no name
POI types: barrier-gate
OSM data version: 2021-02-01T11:34:17Z
#mapsme

"i created this by mistake"
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: 2024-11-07T01:45:44Z
POI name: DHL Χαλκίδα
POI types: amenity-post_office
#organicmaps android

"Πάρκο Κανήθου"
POI has no name
POI types: leisure-park
OSM data version: 2020-07-14T11:22:37Z
#mapsme

I think here is a (private) parking

Δωριεων 8-6

via StreetComplete 61.1