Nagasaki Prefectural Art Museum

Designed by Kuma Kengo (the architect behind Tokyo's Nezu Museum and 2020 Olympic Stadium), this museum straddles a canal in an environmentally friendly building (note the roof garden). The permanent collection covers both Nagasaki-related art and Spanish art, and special exhibits are eclectic, from Chinese art to Chagall. There's a lovely cafe in the bridge over the canal.