The Shard. This one, in a photo snapped by the Lunar Orbiter, has been named "the shard" or "the tower," by Richard C. Hoagland, who comments on this photo at Richard Hoagland's Lunar Anomalies. Taken from a distance of about 250 miles, the strange structure (if that's what it is) would be enormous - seven miles high, by Hoagland's calculations. (The star-like shape above the tower is a camera registration mark.) It's difficult to believe that such a huge structure actually stands on the moon... so what are we seeing in this photo? Is it a plume of "smoke" from some lunar gaseous emission? Are we seeing the ejecta from a meteorite impact? What is it?
The Castle. This strange object, photographed during an Apollo mission, has been named "the castle" by Hoagland. It seems to have a definite structure, like the remnant wall of some ancient building. The bottom looks as if it has rows of support columns, above which is a high spire. Whatever it is, it's much brighter than the surrounding landscape. Is it just a trick of light and shadow? A photographic anomaly? Or is it all that remains of some rich Martian's get-away retreat?
Strange Reflection. This is one of my favorites because it comes directly from a famous photo from the second Apollo mission to land on the moon, Apollo 12. The photo is of astronaut Alan Bean and was taken by Pete Conrad as both stand on the lunar surface. You can see Conrad in the reflection in Bean's visor. You can also see some instrumentation in the foreground of the reflection. But what the heck is that thing hovering in the sky in the background, pointed out here as "artifact" by Luna: Astronauts Among the Ruins? You can even see the shadow it casts on the ground behind Conrad. It's been seen as everything from a UFO to a hanging light fixture by those who think the Apollo landings were faked. Yet this photo is really puzzling. We can usually find reasonable, or at least plausible, explanations for the other photos shown here and elsewhere, but this one is truly enigmatic. What about it NASA? What the heck is that thing?
Yes, we've been to the moon, we have mapped it extensively, and we have brought back lots of rocks for study. But the moon still remains a great source of mystery and wonder.