Where: Maria Enzersdorf, Austria

Start of construction: 12th Century

End of construction: 19th Century

Most important renovation: 19th Century

Accessible: yes, interior with guide

Important fact:

Destroyed in 1529 and 1683 and ruin until 1884, when it was rebuilt (until 1903).

Owned by the royal house of Liechtenstein.

https://www.burgliechtenstein.eu/de/home.html