The Mausoleum of Galla Placidia is a Roman building built in 425-430 AD in Ravenna, Italy. It was listed with seven other structures in Ravenna in the World Heritage List in 1996. The UNESCO 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 interior of the mausoleum is covered with rich Byzantine mosaics, and light enters through alabaster window panels. The inside contains two famous mosaic lunettes, and the rest of the interior is filled with mosaics of Christian and Apocalyptic symbols.
The mausoleum is reputed to have inspired American songwriter Cole Porter to compose "Night and Day" while on a 1920s visit.