The tower was named for its designer, the engineer Alexandre Gustave Eiffel. It was built more than 2,000 years ago to protect China from invaders. Moscow's Kremlin is a walled fortress surrounding palaces, cathedrals, and government buildings. This 184.5-foot marble bell tower was built in Pisa, Italy, about 700 years ago. It began to lean during its construction and now tilts more than 17 feet from the perpendicular.
Stairs lead to the top, where the bells remain silent.
It's thought that the clanging will make the tower lean more. The longest highway in the world, it starts in northwest Alaska and stretches all the way to Chile. It then crosses South America to end in Brasilia, Brazil. This ring of huge stones set in place 4,000 years ago is in the countryside of southern England. No one knows how or why they are there.