The world's biggest religious structure is the Angkor Wat in Cambodia.
Vedas
the Washington monument
shield volcano
The Great Wall of China.
Beaver dam
The Walls of Benin.
The largest religious monument in the world is Angkor Wat in Cambodia, which is a Hindu temple complex originally built in the 12th century.
The largest religious group in the world are Christians. There are over 2,200,000,000 Christians worldwide and the religion is still growing strong. This is almost 1,000,000,000 more than the second largest religion, Islam.
Islam - the second largest religion in the world
Angkor Wat
Washington Monument