Masjid-e-Tooba, Tooba Mosque, also known as Gol Masjid, is located in the city of Karachi, Sindh. It is situated in the phase 2 of DHA (Defence Housing Authority), Karachi. The construction of the mosque began in 1966 and was completed in 1969. The mosque was designed by Pakistani architect Babar Hamid Chauhan and the engineer was Zaheer Haider Naqvi. This mosque has the capacity to hold up to 5,000 people. It has one dome without any pillars with an area of 67 meters.
It is claimed to be the largest single-dome mosque in the world with no pillars in its central prayer hall. Its huge dome is supported on a low surrounding wall. It is the 18th largest mosque in the world as of 2018. It is open for visitors 24/7.