Amber museums

Amber museum in Palanga (Lithuania)
The museum has a wealth of amber pieces with trapped insects or plants, a collection of unique pieces of amber, and examples of fossilized tree resin brought from all over the world. The Palanga Amber Museum - Branch of the Lithuanian Art Museum - was established on August 3, 1963.
http://www.pgm.lt/index_en.htm

Amber museum in Kaliningrad (Russia)
Museum was established as the museum of one mineral. In its exposition amber is viewed in correlation of different sciences: palaeontology, mineralogy, geology, geography, archaeology, history, natural science. The aim of the museum is to systemise natural scientific, historical and cultural, historical and art criticism knowledge  of amber.
http://www.ambermuseum.ru/info/