The document summarizes information about several famous historical sites around the world: - Petra in Jordan, known for its rock-cut architecture and water system, was an important trading city for the Nabataeans. - Machu Picchu in Peru was an Inca estate built around 1450 but abandoned a century later during the Spanish conquest. - Chichen Itza in Mexico was a large pre-Columbian city built by the Maya civilization exhibiting various architectural styles. - Other sites briefly summarized include the Taj Mahal mausoleum in India, Christ the Redeemer statue in Brazil, the Colosseum in Rome, and the Great Wall of China built to