[Archelaos]

It is not that somebody suddenly stumbled upon this castle. It was mentioned in an inventory book from 1454 and in another book form 1596. Also local field names indicated a castle. It is quite common in such cases that there are a couple of canidates for the location of a castle mentioned in a source. It required a thorough excavation to substantiate such a hypothesis.

Here is a description of the site together with a photo: https://www.unsere-burgen.de/de/Burgen-im-LK-Reutlingen/Burg... Judging from the photo, there is no immediately obvious indication that this free standing rock was the site of a castle.