| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Merkenstein ruins |  | Lower Austria | Europe | 1166 | website | Bad Vöslau | Austria | 47.9666671753 | 16.1333332062 | Map |