Located on the Champ de Mars in Paris, the Eiffel Tower has become a global icon of France and one of the most recognizable structures in the world. Named after its designer, engineer Gustave Eiffel, the tower was built as the entrance arch to the 1889 World’s Fair and stands at 1,063 feet tall. It was the tallest man-made structure in the world until the Chrysler Building was built in 1930.
Willis Tower is a 108-story, 1,451-foot (442 m) skyscraper in Chicago, Illinois. At the time of its completion in 1973, it was the tallest building in the world, surpassing the World Trade Center towers in New York, and it held this rank for nearly 25 years.
Chrysler Building is an Art Deco style skyscraper in New York City, located on the east side of Manhattan in the Turtle Bay area at the intersection of 42nd Street and Lexington Avenue. At 1,046 feet (319 m), the structure was the world's tallest building for 11 months before it was surpassed by the Empire State Building in 1931. It is still the tallest brick building in the world, albeit with an internal steel skeleton. After the destruction of the World Trade Center, it was again the second-tallest building in New York City until December 2007, when the spire was raised on the 1,200-foot (365.8 m) Bank of America Tower, pushing the Chrysler Building into third position.
Leaning Tower of Pisa is the campanile, or freestanding bell tower, of the cathedral of the Italian city of Pisa, known worldwide for its unintended tilt to one side. It is situated behind the Cathedral and is the third oldest structure in Pisa's Cathedral Square (Piazza del Duomo) after the Cathedral and the Baptistry. The tower's tilt began during construction, caused by an inadequate foundation on ground too soft on one side to properly support the structure's weight.