Apse mosaic dating from the 12th century, Basilica of San Clemente, Rome, Lazio, Italy, Europe

Apse mosaic dating from the 12th century, Basilica of San Clemente, Rome, Lazio, Italy, Europe

Detail of 13th century apse Byzantine mosaics, Cathedral of Santa Maria Assunta (Duomo Santa Maria dell'Assunta), Torcello Island, Venice Lagoon, UNESCO World Heritage Site, Veneto, Italy, Europe

The apse inside San Giovanni in Laterano Church, Rome, Lazio, Italy, Europe

The apse inside San Giovanni in Laterano Church, Rome, Lazio, Italy, Europe

Ciborium from the 12th century in front of an apse mosaic from the 6th century, Euphrasian Basilica, UNESCO World Heritage Site, Porec, Istra Peninsula, Croatia, Europe

Ciborium from the 12th century in front of an apse mosaic from the 6th century, Euphrasian Basilica, UNESCO World Heritage Site, Porec, Istra Peninsula, Croatia, Europe

Apse mosaic, Santa Maria in Trastevere, Rome, Lazio, Italy, Europe

Apse decorated with mosaics, Basilica of St John Lateran, Rome, Italy, Europe

Apse decorated with mosaics, Basilica of St John Lateran, Rome, Italy, Europe

Apse mosaic in Santa Maria, Trastevere, Rome, Italy, Europe

Christ Pantocrator apse cathedral San Salvatore Cefalu Sicily Sicilia Italy Italia

Mosaics depicting scenes from the life of Mary by Cavallini in the apse of the Basilica Santa Maria in Trastevere, Rome, Lazio, Italy, Europe

The apse and mosaic of the Triclinio Leoniano showing "Christ and the Apostles" on the apse, "Christ transmits the powers to pope Sylvester and to Constantine" on the left of the arch, and "Saint Peter crowns Leo III at the presence of Charles the Great"

Altar room of the Cappella Palatina in the Palazzo dei Normannni also Palazzo Reale, Palermo, Sicily, Italy, Europe

Apse with mosaics by Cavallini in the interior of the Church of Santa Maria in Trastevere in Rome, Italy, Europe

Ciborium from the 12th Century in front of an apse mosaic from the 6th Century, Euphrasian Basilica in Porec, Croatia, Europe

Looking through Romanesque arches towards the apse of the Euphrasian Basilica in Porec, Croatia, Europe

Ciborium from the 12th Century in front of an apse mosaic from the 6th Century, Euphrasian Basilica in Porec, Croatia, Europe

Apse mosaic from the 6th Century, depicting Madonna and Child, Euphrasian Basilica in Porec, Croatia, Europe

Ciborium from the 12th Century in front of an apse mosaic from the 6th Century, Euphrasian Basilica in Porec, Croatia, Europe

Apse Mosaic Virgin and Child at Hagia Sophia, Istanbul, Turkey

Apse Mosaic Virgin and Child at Hagia Sophia, Istanbul, Turkey