The remains of the Castle can be visited
Itterburgen Castle (Ruin) (Thalitter)

The Itterburgen ruin, also known as Löwensteiner Burgsitz, sits on an elongated mountain ridge north above the district of Thalitter in the Hessian municipality of Vöhl. This freely accessible ruin dates back to the 8th century.
History+
The first documented mention of the “Haupthof Ittera” in the Ittergau dates to 793. In the 11th century, the Lords of Itter erected Itterburg Castle at this location. The castle was first mentioned in a document in 1126, when the sisters Rilind and Frederun von Itter, heirs of Folkmar von Itter, who died in 1123, transferred their allodial parts of the Itter dominion as a fief to the Abbot of Corvey. Around 1190, Archbishop Philipp I acquired the castle for the Electorate of Cologne.
Source: Wikipedia · Licence: CC BY-SA 4.0
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 51.2214, 8.8957