In my opinion, Ravenna is one of the finest and most interesting WH sites not just in Italy, but in all of Europe. The remains from the late Roman/early Byzantine Empire and the early Christian era are incredibly well-preserved and the mosaics for which Ravenna is so famous are just stunning in every way. The WH listing consists of 8 distinct sites that can be easily visited on a walk through the city (except for Classe). From the station, I first went to the Arian Baptistry (a small building with a nice ceiling mosaic), then to the Basilica of Sant' Apollinare Nuovo (a large complex with 2 fantastic rows of mosaics plus some hard-to-spot hands showing Theoderic and his court that were not quite removed when the Byzantines reconquered Ravenna). After a detour to Dante's Tomb and the Basilica of San Francesco with its famous groundwater-covered mosaic floor, I went to the Neonian or Orthodox Baptistry (larger and much more decorated than the Arian one, with exceptionally beautiful mosaics) and then to the Cathedral Museum, which houses the Archiepiscopal Chapel and the only remaining oratory from the early Christian era. Then I continued to the San Vitale complex, which includes the Basilica boasting Ravenna's most famous mosaics which show Emperor Justinian and his (in)famous wife Theodora, who, despite never having set foot in the city, still wanted to project their power in their remaining Italian lands. The complex also features the Mausoleum of Galla Placidia, which contains the city's oldest and best-preserved mosaics (a fantastic blue), as well as her sarcophagus (she is buried in St.Peter's in Rome, though). A short walk from the centre, the Mausoleum of Theoderic stands in a pretty park and is the only remaining tomb from a Germanic king (his sarcophagus is of course empty). The final monument, the Basilica of Sant' Apollinare in Classe, stands in the former naval port of Classe, a 5-minute train ride from the city. It has a similar design and construction to its namesake church in the centre (both named after Ravenna's first bishop), maybe with less impressive mosaics. All in all, a highlight of any trip to Italy.