The Nativity of Christ Cathedral (Kristus Piedzimšanas pareizticīgo katedrāle) was built to a design by Nikolai Chagin in a Neo-Byzantine style between 1876 and 1883, during the period when the country was part of the Russian Empire. It is the largest Orthodox cathedral in the Baltic provinces built with the blessing of the Russian Tsar Alexander II on the initiative of local governor-general Pyotr Bagration and bishop Veniamin Karelin. The Nativity of Christ Cathedral is renowned for its icons, some of which were painted by Vasili Vereshchagin.
During the First World War German troops occupied Riga and turned its largest Russian Orthodox cathedral into a Lutheran church. In independent Latvia the Nativity of Christ Cathedral once again became an Orthodox cathedral in 1921. Archbishop Jānis Pommers, a native Latvian, played a key part in the defence of the cathedral. In the early 1960s Soviet authorities closed down the cathedral and converted its building into a planetarium. The cathedral has been restored since Latvia regained independence from the Soviet Union in 1991.References:
The Arch of Constantine is situated between the Colosseum and the Palatine Hill. It was erected by the Roman Senate to commemorate Constantine I's victory over Maxentius at the Battle of Milvian Bridge in 312. Dedicated in 315, it is the largest Roman triumphal arch. The arch spans the Via triumphalis, the way taken by the emperors when they entered the city in triumph.
Though dedicated to Constantine, much of the decorative material incorporated earlier work from the time of the emperors Trajan (98-117), Hadrian (117-138) and Marcus Aurelius (161-180), and is thus a collage. The last of the existing triumphal arches in Rome, it is also the only one to make extensive use of spolia, reusing several major reliefs from 2nd century imperial monuments, which give a striking and famous stylistic contrast to the sculpture newly created for the arch.
The arch is 21 m high, 25.9 m wide and 7.4 m deep. Above the archways is placed the attic, composed of brickwork reveted (faced) with marble. A staircase within the arch is entered from a door at some height from the ground, on the west side, facing the Palatine Hill. The general design with a main part structured by detached columns and an attic with the main inscription above is modelled after the example of the Arch of Septimius Severus on the Roman Forum.