A tip from Jonathan Hoefler led me to the NYPL Digital Gallery, now fully searchable and browsable, with low resolution images free for non-profit use (including personal blogs, though not Wikipedia). Some really fascinating stuff, including a number of University of Virginia related items: detailed close-up shots of the pediments of East Lawn, the post-1895 Rotunda, the serpentine walls, two different views of the famous pre-1895 engraving showing the Lawn from the West with the Rotunda annex, a view of the full map of Virginia from which the 1826 engraving of the Lawn is drawn and a separate close-up of that engraving, other early engravings likely not drawn from life (since they don’t show the terraces on the Lawn) but including the pediment around Pavilion X, the exterior and interior of Edgar Allan Poe’s room on West Range following one of the Raven Society restorations of the room, and my personal favorite, pictures from a visit that Gertrude Stein and Alice B. Toklas made to the University in 1935, including a shot with faculty and students, the pair in front of a pavilion, and this nifty shot of Stein in front of the Rotunda.
I’m pretty sure you could kill hours just looking through this site–for me, the old photos from Newport News are just about as fascinating as the UVA material.