What are stored in a 'columbarium'?

A columbarium is a place for the respectful and usually public storage of cinerary urns (i.e., urns holding a deceased’s cremated remains). The term comes from the Latin columba (dove) and originally referred to compartmentalized housing for doves and pigeons called a dovecote.

Funerary urns (also called cinerary urns and burial urns) have been used by many civilizations. After a person died, survivors cremated the body and collected the ashes in an urn. Pottery urns, dating from about 7000 BC, have been found in an early Jiahu site in China, where a total of 32 burial urns are found, and another early finds are in Laoguantai, Shaanxi. There are about 700 burial urns unearthed over the Yangshao (5000–3000 BC) areas and consisting more than 50 varieties of form and shape. The burial urns were used mainly for children, but also sporadically for adults.