Great Wall of China This newly elected world wonder was built along China's northern border over many centuries to keep out invading Mongol tribes. Constructed between the fifth century B.C. and the 16th century, the Great Wall is the world's longest human-made structure, stretching some 4,000 miles (6,400 kilometers). The best known section was built around 200 B.C. by the first emperor of China, Qin Shi Huang Di. Petra, Jordan Perched on the edge of the Arabian Desert, Petra was the capital of the Nabataean kingdom of King Aretas IV (9 B.C. to A.D. 40). Petra is famous for its many stone structures such as a 138-foot-tall (42-meter-tall) temple carved with classical facades into rose-colored rock. The ancient city also included tunnels, water chambers, and an amphitheater, which held 4,000 people. The desert site wasn't known to the West until Swiss explorer Johann Ludwig Burckhardt came across it in 1812. Christ the Redeemer The 105-foot-tal...
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