This week we look at the finalists for the Art Fund Museum of the Year award, the winner of which will be announced on 26th June. They are a diverse mix but have an interesting - unofficial - connecting theme in that they are all in repurposed buildings. This sort of adaptive reuse is slowly gathering pace in the UK and, given the shockingly high number of good but empty buildings, the potential is enormous. The Golden Thread Gallery on Queen Street in Belfast is in the former 1930s Corporation Gas Showroom.