The ruins of ancient Penjikent, about 60 kilometers from Samarkand across the Tajik border in the Zerafshan valley, are one of the most important archaeological sites in Central Asia. The excavated city shows what a Sogdian merchant settlement of the 7th century looked like — temples, a bazaar, residential quarters, and the walls that once held the famous frescoes.
The site museum has some of the remaining frescoes and artifacts in situ; the best pieces went to the Hermitage and the National Museum of Tajikistan. From Dushanbe, Penjikent is about 280 kilometers via the Anzob Tunnel; combined with the Fann Mountains, it makes a good multi-day excursion from the capital.