Until it reached its planned obsolescence last week, the mythical city of Zuzalu was an intellectual wonderland. Days at Zuzalu began shortly after dawn at the edge of the Adriatic Sea. In the pursuit of an infinite life, Zuzalans (as they self-identify) enjoyed submerging themselves in the frigid waters of Montenegro at 8 a.m.—and again at 1 p.m., depending on their level of...