Boskoop/Espelkamp. Merkur Casino, a subsidiary of the Gauselmann Group with headquarters in Germany’s Eastern Westphalia, has opened a new arcade in a very special building in Boskoop in Holland: A new leisure entertainment centre of the Gauselmann Group was opened on 31st August in the Flora building - a cultural monument that originates from 1935. Queen Beatrix attended the official opening of the entire building compex.