In 1930 Geist added a Noah's Ark style attraction, with a setting resembling Mount Ararat, on the arena's site. The ark was a walk-through exhibit that featured the sounds of rain, thunder, and Noah giving orders. Other additions in the early 1930s included flat rides such as the Rig-a-Jig, Leaping Lena, Cave O'Laffs, and the Pretzel. A wooden roller coaster called the Atom Smasher was added in 1938. Designed by Vernon Keenan, it measured long and had a maximum height of .