One third of Rome’s ancient art collection is conserved at this branch of the Museo Nazionale Romano. Among its treasures are a major coin collection, extensive maps of trade routes (with audio and visual exhibits on the network of traders over the centuries), and a vast sculpture collection that includes portrait busts of emperors and their families, as well as mythical figures like the Minotaur and Athena. But the real draw is on the second floor, where you can see some of Rome’s oldest frescoes ★★ depicting an entire garden, complete with plants and birds, from the Villa di Livia in the city’s northern Prima Porta. (Livia was the wife of Emperor Augustus and deified after her death in a.d. 29.)