The area of Proclus crater. See description!

The area around the crater Proclus, located on the isthmus between the Sea of Crises and the Sea of Tranquility, is interesting because under certain lighting conditions, two mountain ridges in the Proclus R 1 region appear to connect, forming a "bridge." This was first noticed in 1954 when the May issue of *Sky & Telescope* magazine, published by Harvard University (USA), featured an article describing... a bridge photographed on the lunar surface, connecting two mountain ridges near the Sea of Crises. According to John O'Neill, science editor of the *New York Herald Tribune*, as well as English astronomers H.P. Wilkins and Patrick Moore, the photograph indeed showed a bridge, not a random rock formation merely resembling one. Wilkins calculated that this bridge was about 20 km long, and Polish journalist and researcher Robert Lesniakiewicz adds that it rose about 1,600 meters above the lunar surface and was about 3,200 meters wide. A truly cyclopean structure! But in reality, it's just a play of light and shadow :).