What is the biggest mosque in the world?

Answer 1

The largest mosque in the world is the Masjid al-Haram, also known as the Grand Mosque.

The current structure covers an area of 4,008,020 square metres (990.40 acres) including the outdoor and indoor praying spaces and can accommodate up to four million Muslim worshippers during the Hajj period, one of the largest annual gatherings of people in the world.
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Answer 2

The Grand Mosque in Mecca, Saudi Arabia, also known as the Masjid al-Haram, is considered the largest mosque in the world. It surrounds the Kaaba, the most sacred site in Islam, and can accommodate millions of worshippers during Hajj pilgrimage.

Answer 3

The world is a large place. A mosque can be built even at a very small place. It is not possible for any one to say which mosque is the smallest. Moreover, what good will come out if some one says that the smallest mosque is situated at such and such place?

Answer 4

Angkor Wat temple in Cambodia, dating from the 12th century AD, is considered the largest religious structure in the world. Originally a Hindu temple, it is a currently a Buddhist shrine.

Another temple complex of considerable size is the Akshardham temple complex (also Hindu) in Ahmedabad, India.