Almost a suburb in itself, Holešovice’s sprawling city market is in a slightly depressing state, but there are plans to change that soon. Until then, your only reason to visit may be the open-air area selling fresh produce (Hall 22), restaurants such as Tràng An and Sasazu, or the Jatka 78 theatre.
Note that it's officially called Pražská tržnice, but is better known locally as Holešovická tržnice (Holešovice Market).