Worshippers arrived for the first morning prayers at the giant Camlica Mosque in Istanbul on Thursday.
Occupying an area of 15,000 square metres on the Anatolian side of the city, Camilca is now the largest mosque in Turkey.
Construction began in 2013 and was marked as one of President Recep Tayyip Erdogan's megaprojects for the country.
It was designed and created by two female architects, Bahar Mizrak and Hayriye Gul Totu, at a cost of $66.5 million, according to the government-aligned newspaper Daily Sabah.
Featuring six minarets – two of which are over 100 metres tall – and a main dome that is 72 metres high. On top of the dome is the world's biggest finial – which is 7.77m long and weighs about 4 tonnes.
The mosque is capable of hosting 60,000 worshippers.
