Before moving into Olympic Stadium in 1977, the Expos played their home games at
Space was so tight that there was nowhere to put the bullpens. Nowhere convenient, anyway. There was little foul territory and MLB rules said bullpens could not be in placed in the field of play following the 1964 season. With no obvious place to put them, the club had to think outside the box. Or maybe I should say on top of the box, because the bullpens wound up on top of the dugouts:
Man, they just don't make baseball parks like they used too.
(Photo via @darenw)
UPDATE: We've been duped! The bullpens at Jarry Park Stadium were not on top of the dugouts, they were in foul territory in the outfield. The photo just makes it appear the pitcher is atop the dugout. My mistake.