Château de Freundstein is a ruined castle in the commune of Goldbach-Altenbach. The castle was recorded in 1297. It ownership was shared between the abbey at Murbach and the bishops of Strasbourg. It waas given as a fiefdom to the Waldner family who still own it. In 1441, it was attacked by the Mulhouse and in 1525 by rebellious peasants. It was restored in the 16th century, but abandoned shortly afterwards. The ruins were used as a military observatory during the First World War. The ruins consist of sections of wall from the high castle, with loopholes and more recent openings.
References:Caernarfon Castle in Gwynedd, Wales, is recognised around the world as one of the greatest buildings of the Middle Ages. It was a motte-and-bailey castle from the late 11th century until 1283 when King Edward I of England began to replace it with the current stone structure. The Edwardian town and castle acted as the administrative centre of north Wales, and as a result the defences were built on a grand scale. There was a deliberate link with Caernarfon's Roman past, and the Roman fort of Segontium is nearby.
While the castle was under construction, town walls were built around Caernarfon. The work cost between £20,000 and £25,000 from the start until the work ended in 1330. Although the castle appears mostly complete from the outside, the interior buildings no longer survive and many of the building plans were never finished. The town and castle were sacked in 1294 when Madog ap Llywelyn led a rebellion against the English. Caernarfon was recaptured the following year.