It's a 300 m walk (5 min) from exit C1 of the Muxidi metro station on line 1. Continue forward before you reach the pedestrian bridge and it is the big building on your right. Free admittance with a passport. There are five floors with exhibits on Beijing's history and culture. The 5th floor is hutong culture with displays of traditional marriage, Chinese new year, and birthday (longevity); this was my favorite. All items are beautifully arranged, behind glass with a direct spotlight, with simple English names but there's no further English text about the details. In each showroom, there are attendants whom carry paddles with pictures of prohibited acts (like no flash photography, etc). They repeatedly walk the full perimeter of the room carrying their paddles at mid-waist; it is hypnotic to watch them. Each floor has a souvenir store that is related to the theme of the floor. A very modern museum with beautifully arranged exhibits. You need 2-3 hours.