It is an interest of mine to visually observe features described by the classic telescopic selenographers, particularly Goodacre, and Wilkins & Moore. You would be surprised to see how many of the features that they describe can not be seen in spacecraft-based imagery. Many of these features have been claimed to be product of the imagination of the observers, specially in the case of Wilkins. I don't believe that it is always the case, or at least it's not that simple.
An example of such feature is a secondary crater chain on the glacis of Bullialdus first observed by Goodacre. The chain runs from Bullialdus to König (formerly called Bullialdus C). This chain is almost invisible in Lunar Reconnaissance Orbiter imagery (third panel). Interestingly, the right conditions of illumination render it visible for telescopic observers, as the attached LTVT DEM simulation shows (central panel).
Here is what Goodacre had to say about this feature:
"From near the break in the S.E. wall of Bullialdus and extending towards C (now called König) is a chain of craterlets not shown on any previous map and absent from the M. Willson photograph. This is not a difficult object and should be looked for when the morning terminator is near Hippalus. It was first seen in 1929 April 18 and subsequently 1931, May 26. The chain of craters diminish in size as it proceeds towards C before reaching which it fades out as a cleft." Also see Goodacre's drawing of the area as it appeared in his classic book "The Moon: With A Description Of Its Surface Formations" (first panel).
Wilkins & Moore said: "Between König and Bullialdus are two oval, ridge-bordered enclosures, traversed by craterlet chains resembling clefts".
Anyway, in this day and age it is often claimed that everything on the Moon has been photographed and there is nothing left or new to see with an Earth-based telescope. The continuously changing angle of illumination on the lunar surface makes such statement not entirely accurate. I would say that yes, the Moon has been measured in it's entirety with spacecraft-based laser altimetry, but some features have yet to be photographed/observed. This post is to encourage observers to chase these features.