The Schnütgen Museum in Cologne , Germany is devoted to Christian religious art, mainly medieval, but some parts of the collection, such as its textiles and prints, extend from antiquity to the modern period. In 1906, the collection of Alexander Schnütgen was donated to the city, and the collection has continued to expand, so that until the opening of a new building in 2010, only about 10% of its 13,000 items could be displayed. Now some 2,000 objects are on display in 1900 sq. metres of gallery space, with an additional 1300 sq. metres for special exhibitions. Schnütgen was a Catholic priest and theologian; according to the museum website "Up to now people tell stories about his zealous and sometimes crafty collection tactics".

More details: https://en.wikipedia.org/wiki/Schn%C3%BCtgen_Museum