Building-like object similar to a castle has been evident in the past on the NASA image AS10-32-4822 . From the official NASA web-archive, it seems to be no anymore evident the presence of this strange building. It is located in the lunar region between Rima Hyginus and Boskovic. The MN0000 shows a modular construction and high light reflectivity. Because its shape, it is commonly called "The Castle".
Old image AS10-32-4822: the MN0000 is evident above the Hyginus crater.
Current image AS10-32-4822 as stored in the NASA web-archive. Credit NASA.