Retretti was a major art museum in Punkaharju, Finland. It was unique in that most of its exhibition space was underground. The man-made caves total 3,700 square metres and reach a depth of 30 metres.
There was a souvenir shop and a restaurant in the premises.
Retretti Oy went into bankruptcy in autumn 2012. A new company now operates an art venture in Savonlinna city centre under the name Retretti, but reopening the underground exhibition spaces was not a priority in 2013.
Wikipedia https://en.wikipedia.org/wiki/Retretti
Address (Unnamed Road), 58450, Finland
Coordinates 61°48'12.192" N 29°17'23.736" E