Isenburg is a ruined castle located high above the valley of the Zwickauer Mulde. Archaeological finds indicate that this site already existed in the 12th century. Little is known about the history of spur castle and its violent destruction. There are no verified, documented references. Oral traditions - the first account dates to 1738 - called the Isenburg a 'robber castle,' the 'Old Castle' and the 'Iron Castle', from which its present name is derived. The castle had been destroyed by the 14th century and was never rebuilt. Its ruins were probably used from the 15th to 17th centuries as shelters for the local population during times of conflict. Around 1750, the remains of the castle were demolished to build the stone church in Wildbach.
The recommended way to visit the castle ruins is by foot from Hartenstein railway station which takes about 30 minutes. Only about 200 metres from the station is Stein Castle. At this spot the route crosses the Zwickauer Mulde river to a point immediately below Schloss Wolfsbrunn. Here the route turns left and winds through the Poppenwald upstream and parallel to the Mulde. After a short, but steep, climb known as 'Gentle Henry' (Sanfter Heinrich), the path forks. Keeping right, the route passes the Wildbach Church on an easy forest path. Here there are signs to the ruins which are another 700 metres further on.
The left-hand fork leads via a wild and romantic narrow path on top of the river bank of the Mulde to the same destination. This path is called the 'Raubrittersteig' ('Robber Baron Climb') and is one of the most attractive walks in the Mulde Valley.
References:The Villa d'Este is a 16th-century villa in Tivoli, near Rome, famous for its terraced hillside Italian Renaissance garden and especially for its profusion of fountains: the extraordinary system contains fifty-one fountains and nymphaeums, 398 spouts, 364 water jets, 64 waterfalls, and 220 basins, fed by 875 meters of canals, channels and cascades, and all working entirely by the force of gravity, without pumps. It is now an Italian state museum, and is listed as a UNESCO world heritage site.
Tivoli had been a popular summer residence since ancient Roman times due to its altitude, cooler temperatures and its proximity to the Villa Hadriana, the summer residence of the Emperor Hadrian I.
The Villa was commissioned by Cardinal Ippolito II d'Este (1509-1572), second son of Alfonso I d'Este, the Duke of Ferrara and grandson of Pope Alexander VI, along with Lucrezia Borgia.