 However, with the opening of Baltimore's Camden Yards (1992), the "minimum distance" rule began to be ignored.One factor may be that the quaint, "retro" look of Camden Yards, with its irregular measurements, proved to be very popular, along with a traditionalist backlash against the symmetrical, multi-purpose, "cookie-cutter" stadiums.Since the opening of Camden Yards, many other "retro" stadiums have been built, each with asymmetrical fences.