The remains of the Castle can be visited
CastleWittnau
Alt-Homburg Castle

The Homburg was built around 1100 by the Counts of Froburg. Rudolf von Froburg (mentioned in 1082) lived in the castle with his wife Ita von Habsburg. From their marriage sprang Werner and Rudolf Herrmann IV von Froburg, who had married the heiress of the last Count of Alt-Homburg.
Source: swisscastles.ch · Image: http://www.swisscastles.ch/Aargau/althomburg.html
Text and/or image for this object come from the linked site and are used with the permission of its operators; the linked page remains the copyright of its authors. The legacy catalogue kept text source and image source in a single field, so which part came from there can no longer be told apart entry by entry.
Location: 47.4911, 7.9731