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Stonehenge is probably the best-known ancient monument located in England. Stonehenge is a circle of large standing stones surrounded by smaller ones. The purpose of this monument is unknown, but there are many legends and theories. The most popular theory these days is based on various measurements. It is believed that Stonehenge is a calendar. Though nobody knows what the purpose of this amazing construction was, it is a must-see place for visitors of England.(2) Machu Picchu is the best-known and most mysterious ancient monument located in Latin America. Some archeologists think that Machu Picchu was built around 1450, at the height of the Inca Empire development. It was deserted about 100 years later, in 1572 — nobody knows why. For many centuries Machu Picchu was unknown to the outside world. In 1911 the American historian Hiram Bingham found the ruined city. Since then, thousands of tourists have visited Machu Picchu. (3) Egypt is one of the most mysterious places on the planet. Located in North Africa, this country has more than 110 pyramids. Many of the pyramids, made of giant stones weighing up to 100 tons, are about 60–140 metres high. No one knows how the pyramids were built.(4) Easter Island lying between Tahiti and Chile has gained international popularity. Have you ever heard of its gigantic statues shaped like human faces? Made of volcanic stone each statue is 14 feet tall on average (about 4 metres) and weighs about 75 tons. It is a mystery how ancient primitive people could erect these statues