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This church, which was started in 1570 and completed in 1606, was built by the Jesuits. It sits on top of an indigenous ceremonial site. It is known for its beautiful murals, which earned it the name of the "Sistine Chapel of the Americas". While simple on the outside, it's extremely dramatic and decorative on the inside. It's also claimed to hold a wealth of gold and silver treasures, so many that locals volunteer to watch the church 24 hours a day for security purposes.