By the time of Martian Dreams, the towers had fallen into disrepair. The first (found at 55N, 100E) had a defective motor and the Avatar had to ask Thomas Edison in Olympus to repair it. The second (at 59N, 23W) was overgrown with weeds and had to be freed with weedkillers. The third (at 55N, 125W) had a broken lens, that needed to be repaired by Louis Comfort Tiffany in Elysium.