| name | image | style | date demolished | type | use | administrative division | continent | date completed | date Start construction | Website | Height (m) | city | Country | latitude (°) | longitude (°) | Original_owner/Owner/Protection | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kastelholm Castle |  | Water Castle | Museum/exhibition | Åland Islands | Europe | 14th century | website | Sund, Åland | Finland | 60.2330555600 | 20.0805555600 | Map |