Inside Bürg Crater

Bürg is a 40-Km (about 25 miles) diameter, Copernican-aged, complex crater located within Lacus Mortis (the Lake of Death), on the Near-Side of the Moon.
Complex craters, like this one, have terraced walls and a Central Peak (not shown here). The Rim of the crater is along the right side and the walls slope down towards the left of the image.
The terrace is about 3,5 Km (about 2,2 miles) wide and is pockmarked with smaller craters. Terraces form as sections of the Crater wall slump downward after the impact (image width: about 7,9 Km across, roughly 4,9 miles).

Note that there are very few impact craters on the wall of the Crater. Usually fewer craters indicate a surface is younger, however in this case it's simply that material slides down the crater wall's steep slopes, erasing craters.
Note also that LROC, LRO's camera, is powerful enough to see a shadow cast by a boulder about 8 mt wide (about 26 feet) at the contact between the wall and the terrace near the top of the figure.