Northwest · 2 nights · April to May, and September to October
Xi'an
An old capital that still eats lamb, wheat, and chili oil inside a complete city wall.

Wall, warriors, a Muslim quarter
Xi'an works because the ancient part is still a neighborhood, not a fenced ruin. The Ming wall is a bike loop at dusk. The Muslim Quarter is a dinner walk, smoky and specific, not a museum of Silk Road clichés. The Terracotta Army sits well east of town: go at opening, with a booked slot, and leave when the coaches arrive. One full day in the city and one morning at the pits is enough unless you are chasing museums.
See
Terracotta Army 兵马俑
Pit 1 is the famous hall. The smaller pits and the bronze chariots are where you slow down. Book the morning.
City wall 西安城墙
Rent a bike and ride the top late in the day. The south gate is the theatrical entrance; the ride is the actual pleasure.
Muslim Quarter 回民街
Walk in hungry, ignore the first ten shouting stalls, and eat where the locals are queued for bread and lamb.
Great Mosque 西安大清真寺
A Chinese courtyard mosque tucked off the market lanes. Quiet, and a useful reset from the grill smoke.
Eat
Roujiamo
Chopped braised pork in a hard wheat bun. Eat it hot, standing up, before the bread softens.
Yangrou paomo
You tear the bread yourself. The broth should taste like lamb, not like a sweetened soup.
Biangbiang noodles
Belt-wide noodles under chili oil, vinegar, and garlic. Signs may show a character your phone cannot type.