This is now a museum, in the basement underneath the Hotel Intourist, which used to be the Univermag department store during the Battle of Stalingrad. Paulus used it as his headquarters during the closing days of Operation Ring, till his capture.
It has a replica of Paulus room, signallers, first aid post and other equipment. Most unique of all, is a painting of a child given a gift to a German prisoner after capitulation, signifying the fact some of the German troops were kind to the civilians.
A Russian Child Giving German Prisoner A Gift
First Aid Post