The remains of the Castle can be visited
CastleBreitenstein-Klamm
Klamm Castle

In the 11th century, there was a lordship in Klamm, administered by ministeriales of the Formbach family. However, these Lords of Chlamme are only documented between the years 1109 and 1144.
Source: wehrbauten.at · Image: https://commons.wikimedia.org/wiki/File:Ruine_Klamm_Breitenstein,_%C3%96sterreich.JPG
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Location: 47.6600, 15.8675