Real set???

i know that all of the sets are real, but the scene of the jockey chair rising out of the floor a real set? not the set itself, just the jockey chair, is that done with cgi or did they really build that? i used to think it was just cgi until i found out that the one set in Indiana Jones 4 (the temple thing with the 4 pillars that rise up and break the floor open, cant find a pic) was a real set, idk how they did it but that was not cg, so i have no idea if this is cg or not. what do you think???