What if your doctor actually prescribed you a trip to the beach? These days we go to the beach to relax and rejuvenate. But we used to believe that a trip to the beach would actually cure us. Eighteenth century British beachgoers dunked themselves in the chilly waters of the North Sea to relieve their moral and physical ailments. For decades, taking in sea air and drinking seawater was prescribed with medical certainty. Through the tuberculosis epidemic of the nineteenth century, the seaside was a place of refuge and rehabilitation for the wealthy. Eventually, as the middle class flocked to the beach in the twentieth century, we turned our gazes from the sea to the sun–the new source of therapeutic wonder that rejuvenated and revitalized us with the tans to prove it. Here’s the full story on The Atlantic.