The document summarizes 7 famous historical sites considered wonders of the world: the Taj Mahal in India built in memory of an emperor's wife; Chichen Itza, a Mayan city in Mexico built between the 9th-12th centuries; Christ the Redeemer statue in Rio de Janeiro constructed in the 1920s-30s; the Colosseum in Rome built in the 1st century AD; the Great Wall of China built to protect China's borders; Machu Picchu, an Inca city in Peru from around 1400; and Petra, a city carved into rock in Jordan dating to 1200 BC.