Final answer:
The Church of San Vitale in Ravenna is a hall church in Italy and an example of an Eastern church. It lacks the long hallway (nave) in the shape of a cross and instead has an ambulatory or aisle surrounding the central space.
Step-by-step explanation:
A hall church in Italy is the Church of San Vitale in Ravenna. It is a prime example of an Eastern church, showcasing the architectural style of the Eastern Empire (Byzantine Empire). The distinguishing characteristic of a hall church is the absence of a long hallway (the nave) in the shape of a cross. Instead, it has an ambulatory or aisle that surrounds its central space, as well as an extension with an apse at the end.
The four-side aisles encircle the nave, which boasts the tallest vaults in any cathedral standing at 45 meters. This architectural marvel has the flying buttresses ingeniously concealed from the façade, showcasing a grand entrance while providing strong support for the massive stone ceiling.