TEXT: It's true—many enjoy using outdoor swimming pools to exercise, spend time with friends or family, and work on their tans. And while the winter months may not be conducive for swimmers, or their tans, an easy alternative exists: indoor swimming pools. What some of these closed pools lack in natural outdoor gratification, they certainly make up for with stunning interiors. From Budapest to Berlin, AD surveys 13 of the world's most dazzlingly fashioned indoor swimming pools.    Shown here is Bramley Baths, a historic pool in Leeds, England. First opened in 1904, the building, which still features its original brickwork, was once a factory for producing metal castings.