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Third. The Great Wall of China
More than 2,000 years ago the first emperor of China built this wall
to keep out China’s enemies from the north. The Great Wall is the lon-
gest wall in the world. It stretches for 2,400 kilometres from Western
China to the Yellow Sea. The wall is made from earth and stone. Watch-
towers were built every 200 metres along it. Chinese sentries sent warn-
ing signals from the towers if anyone attacked the wall. The signal was
smoke by day and a fire at night.
Fourth. The Leaning Tower of Piza
This is a round bell tower in the city of Piza in Italy, which leans
to one side. The citizens of Piza like to believe that the architect of
the Leaning Tower deliberately planned it that way because he was a
hunchback. Actually the soft soil beneath the foundation gives way. This
causes the unsafe angle. On its completion in 1372, the tower leaned 14
feet off and it has been moving further ever since at the rate of a few
inches a year. Nowadays the tower is in danger of falling down com-
pletely.
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