Hagia Sophia is often referred to as a wonder of the world and is one of the most impressive pieces of historical architecture that has still survived up to this day. Built in the 6th century AD under the direction of Byzantine Emperor Justinian I as a church, it later became a mosque and now acts as a museum to display the rich history that surrounds it.

The Basilica Cistern is the largest ancient cistern that lies beneath the city of Constantinople. The cistern is just 150 metres southwest of the Hagia Sophia and was built in the 6th century under the rule of Byzantine Emperor Justinian I. In the past, the basilica contained gardens that faced the Hagia Sophia, but it was razed in 532 and subsequently rebuilt after the riots.

Also known as The Church of the Holy Saviour, this medieval Byzantine church started life in the 4th century as a typical monastery. However, Chora Church was outside of the walls of Constantine the Great but was eventually incorporated within the city’s defences when Theodosius II built new walls between 413 and 414.

Known as the Aqueduct of the Grey Falcon (Bozdogan), the Valens Aqueduct is a Roman aqueduct that was completed in 4th century AD by Roman Emperor Valens. It was maintained and used by the Byzantines and provided water to the citizens of Constantinople. The surviving section of the aqueduct is around 920 metres long which is only 50 metres less than the original length.