Season 7’s Pillars of Atlantis
The Pillars of Atlantis are an obstacle, used as the first obstacle in the Qualifier during episode 4 of Season 7.
Contestants must crawl through a shaking tunnel and over a piston on one beam, ride a hidden platform up through a hole, and cross a second beam while avoiding three swinging pillars.
It was replaced by the Door Knockers (renamed The Johns) (which was used as the first obstacle in the Qualifier during episode 2 of the same season) in the next episode.
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Season 7’s Mayan Ruins
In episode 9, it was renamed the Mayan Ruins, and the piston featured foam.