A medieval well beneath Glasgow Cathedral, and what came out of it

St Mungo's Well sits in the crypt of Glasgow Cathedral and dates back to the 13th century. Last year, as part of Glasgow's 850th celebrations, the arts collective Aproxima excavated it for the first time in living memory, working with Glasgow University archaeologist Professor Stephen Driscoll and David Sneddon of Clyde Archaeology.

The one-day dig pulled up dice, rings, glasses and coins from around the world, and shed a bit of light on the city's medieval roots and its old traditions of pilgrimage and healing. The well has since been fitted with a glowing mosaic by Aproxima and artist Joanna Kessel, designed by James Johnson, made from over a thousand handblown glass tiles from Venetian makers Orsoni, each inlaid with gold leaf.

A new exhibition, From Well to Wellspring, now tells the whole story and displays the finds. Free entry. It's at Glasgow City Heritage Trust, 54 Bell Street, Wednesday to Friday until 18 September. The mosaic itself is free to view in the Cathedral crypt during opening hours.