One of my favorite places in all of Beijing is the 798 Art District, featuring an array of galleries, shops, and small cafes built into the remains of an old military weapons factory. The area is worth the trip if only for the unique architecture and mix of new and old. Graffiti and street art livens up each and every street, giving any visitor an eyeful of art even without entering any of the buildings. There are both free and ticketed galleries, although tickets never seem to be over 5-15 yuan for any one gallery. This is one place to definitely not miss on your Beijing tour.