Mausoleum of Galla Placidia
The Mausoleum of Galla Placidia
Galla Placidia
Aelia Galla Placidia , daughter of the Roman Emperor Theodosius I, was the Regent for Emperor Valentinian III from 423 until his majority in 437, and a major force in Roman politics for most of her life...

is a Roman
Roman Empire
The Roman Empire was the post-Republican period of the ancient Roman civilization, characterised by an autocratic form of government and large territorial holdings in Europe and around the Mediterranean....

 building in Ravenna
Ravenna is the capital city of the Province of Ravenna in the Emilia-Romagna region of Italy and the second largest comune in Italy by land area, although, at , it is little more than half the size of the largest comune, Rome...

, Italy
Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

. It was listed with seven other structures in Ravenna in the World Heritage List in 1996. The UNESCO
The United Nations Educational, Scientific and Cultural Organization is a specialized agency of the United Nations...

 experts describe it as "the earliest and best preserved of all mosaic monuments, and at the same time one of the most artistically perfect".

The mausoleum is laid out in a Greek cross plan with a central dome on pendentives and barrel vaults over the four transepts.