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 and reach a depth of .
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 http://yle.fi/uutiset/taidekeskus_retrettia_pyorittamaan_uusi_osakeyhtio/6436832 in 2013.