British painter J.M.W. Turner was both prolific and peripatetic, producing more than 30,000 watercolors during a lifetime in which he traveled throughout Europe.
But these works are extremely susceptible to light damage and can be shown only once in a generation. Now, they’re on view at the Mystic Seaport Museum in Connecticut — their only North American stop. Jared Bowen of WGBH reports.