This is the old castle constructed during 1700 - 1717. The Castle is built with large stones, looks like the conglomerate. The shapes of different stones are really awesome.
The Hercules is popular tourist site in Kassel Wilhem Hohe. People can reach there using Tram and Bus from Wilheim Hohe. The ticket is 6 Euro for two persons (two way). This ticket is valid for 24 hours and can be used in all trams and buses. It is beautiful castle and must visit site at nearby goettingen.