Altpernstein is a medieval castle in Micheldorf, Upper Austria. The erection begun around the year 1000. The surrounding area is the protected landscape lsg16 of Upper Austria.
<a href="//commons.wikimedia.org/wiki/User:Isiwal" title="User:Isiwal">Isiwal</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>