OSM tag name=Hamtoren matches Hamtoren in these Wikidata fields:
| Castles in Utrecht (province) | tourism=attraction, place=locality, historic=ruins, building=castle, historic=archaeological_site, historic=tower_house, building=ruins, historic=castle |
| Towers completed in the 13th century | man_made=tower, man_made=water_tower, building=tower |
| Towers in Utrecht (province) | man_made=tower, man_made=water_tower, building=tower |