He was followed at the beginning of 18 century the house Nassau-Oranien (Netherlands). In 1692, almost all town houses were destroyed in a big fire. On August 10, 1697, the Russian Tsar Peter the Great visited Coppenbrügge, together with the Elector Sophia of Hanover and the Elector Sophie Charlotte of Brandenburg , On September 18, 1740 came Frederick II of Prussia. 1764, the old sulfur spring was renewed in the Coppenbrügger Landwehr and expanded for healing purposes. Spiegelberg came to the Westphalia in 1810, and the Vienna Congress (1815) brought the county back to the Nassau-Oranien (Netherlands). But already in 1819 Spiegelberg was sold as "Amt Coppenbrügge" to the Kingdom of Hannover, it became Prussian in 1866. In 1875, the Hamelin-Hildesheim railway line was built, and a few years later (1906) Carl Netter founded Sanatorium Lindenbrunn. The Feuerhake fountain was built in 1908. He was a thank the community Coppenbrügge Ernst fire hook (1850-1924), who donated a water pipe to the community. He also donated the two large colored windows in the sanctuary of St. Nicolai Church. Since 1945 Coppenbrügge belongs to the state of Lower Saxony. In 1957, the outdoor pool was inaugurated. In 1958, the basic renovation of the church was completed. In 1962, the dissolution of State ownership and the sale and demolition of the buildings took place. The farmhouse became state forestry office. In 1969, the sanatorium Lindenbrunn was abandoned by its owners and sold to the association for the care of the severely handicapped. 1972/1973, the newly established hospital Lindenbrunn was inaugurated with a capacity of 255 beds. In 1976, the indoor pool was opened. After thorough renovation of the castle ruins and the former district court building took place in 1986, the opening of the museum in the castle. In 1993, the last districts were connected to the central water supply and to the central sanitation. In 2011/2012, the outdoor pool was completely renovated. The swimming pools are now heated with district heating from a biogas plant in Brünnighausen. The indoor pool was also rebuilt and the entire roof area equipped with solar panels. In the school year 2015/16, the Free School Weserbergland opened its doors in the rooms of the former Special School, an Ersatzschule in Independent Sponsorship, which after the Montessori approach works. Notable residents Bendix Hallenstein (1835–1905), merchant and politician See also Museum in the Castle Coppenbrügge St. Nicolai (Coppenbrügge) Feuerhake