This treasure trove of Soviet ephemera, pre-revolutionary antiques, WWII artefacts and bonkers kitsch from all eras is truly worth travelling for. Exit the metro station to the right and follow the crowds across the train tracks. Continue beyond the large permanent market, which is of very little interest, until you come to a huge area of independent stalls, all varying in quality and content.
The sheer size of the place means you’ll really have to comb it to find the gems.