The last Saturn V is in a building down at Kennedy. Huntsville has most of another (the last two Apollo missions to the moon were cut). They had to move it indoors about 10yrs ago as the weather was taking it's toll on it. Truely massive scale of that stuff. The crawlers are about 5 stories high and have a surface area of almost two acres.
When I was at Redstone in Alabama we saw the testing station for the engines, there were 7 water pumps for cooling. 5 were needed for a Saturn stage one engine (two reserve). By comparison the Shuttle main engine needs two pumps. The platform was anchored several hundred feet into the mountain and during tests seismic instruments registered earthquakes in ten surrounding states. Housewifes in Huntsville compained about broken dishes, stuff knocked off walls and shattered windows after each test.
The Russians built two, even larger rockets. Both blew up on the pad.