The photographs of the moon made by the Lunar Orbiter camera and posted for free access on one of them was discovered a strange object like the tower having a curved shape.
The object is very large and this can be judged by the fact that it can be seen very well above the surrounding terrain, although the picture was taken with a very large height and a small object would not be visible at all.
This is not a defect of the photo because the object casts a shadow on the lunar surface. What could it be? Natural formation, but nothing like on the moon haven’t met yet, and what natural object may look like from space.
Maybe it’s an artificial object of extraterrestrial civilizations, for example something like antenna or communication tower…