1) is a series of fortifications in China. They were built across the historical northern borders of ancient Chinese states and Imperial China as protection against various nomadic groups from the Eurasian a) Great Wall of China b) Chichen Itza c) Colosseum d) Christ the Redeemer 2) It is an ivory-white marble mausoleum on the right bank of the river Yamuna in Agra, Uttar Pradesh, India. It was commissioned in 1631 by the fifth Mughal emperor, Shah Jahan, to house the tomb of his beloved wife, Mumtaz Mahal; it also houses the tomb of Shah Jahan himself. a) Lighthouse of Alexandria  b) Colossus of Rhodes c) Temple of Artemis d) Taj Mahal 3) is an Incan citadel set high in the Andes Mountains in Peru, above the Urubamba River valley. Built in the 15th century and later abandoned, it’s renowned for its sophisticated dry-stone walls that fuse huge blocks without the use of mortar, intriguing buildings that play on astronomical alignments and panoramic views. Its exact former use remains a mystery. a) Petra b) Hanging Gardens of Babylon c) Machu Picchu d) Angkor Wat 4)  is the world's largest coral reef system, composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometres over an area of approximately 344,400 square kilometres. a) Mausoleum at Halicarnassus b) Stonehenge c) Colossus of Rhodes d) Great Barrier Reef

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