Well (a Dutch 'welput'), Boazum, Netherlands

On the 16th of July 2017, a large hole opened up in the garden of a family in the Frisian village of Boazum, the Netherlands. The residents soon realised that it was the result of a collapse above a previously unknown brick-lined well in an overall good state of conservation. The construction was documented by using photogrammetry, and the resulting 3D model proved valuable for a further constructional and functional analysis. The well dates from the 19th century. It probably served to cool a nearby milk-cellar of an older farm that was demolished sometime after 1881. See also: https://www.academia.edu/38117271/