Eiffel Tower

• Built for the 1889 Exposition Universelle in Paris, France by Gustave Eiffel, the Eiffel Tower took more than two years to complete. The theme of the 1889 French World's Fair was a celebration of the 100th anniversary of the French Revolution. At the time it was built, the Eiffel Tower surpassed the Washington Monument to become the tallest tower in the world. Following the World's Fair, antennas were added to the top of the Eiffel Tower extending its height to 324 meters and allowing it to be a strong telecommunications and radio beacon, as well as an important military radio post over the years. Visitors can purchase tickets to ascend to the top for a panoramic view of Paris. As many as 7 million people visit the Eiffel Tower each year.
  
  

Space Needle

• The Seattle Space Needle is one of the most distinguished World's Fair monuments ever built, standing at 605 feet and located north of downtown in Seattle Center. Seattle used the Space Race between the United States and the Soviet Union as the theme of the the1962 Seattle World's Fair. With competition fierce to orbit and land on the moon in the early 1960s and cities fighting for the fledgling aerospace industrial companies, Seattle stood out with its visionary Space Needle monument. More than 9 million people visited the northwestern capital in 1962, where they found futuristic exhibits and a brand new monorail leading the way to the tower. Visitors can purchase a ticket (children under age 4 are free) to ride the elevator to the observation deck at the top for wide-angle views of the city. There are fountains, eateries, shops and theaters nearby.
  
  

Louisiana Purchase Monument

• For the 1904 World's Fair in St. Louis, Missouri, the city celebrated the 100th anniversary of the Louisiana Purchase, fittingly in St. Louis because at the time of its purchase, the city was part of the land that was included in the treaty. More than 20 million people attended the six-month event, greeted upon their entrance into the plaza by the E. L. Masqueray-designed monument. The sculpture stood more than 100 feet tall and was crowned by a figure at the top standing on a globe held up by four smaller statues representing the four earthly directions of north, south, east, and west. The figure was named Peace to symbolize the Fair's desire for peace in the world.
  
  

Crystal Palace

• London hosted the first World's Fair in 1851 and constructed the famed Crystal Palace for the event. The theme of the 1851 expo was "The Great Exhibition of 1851" as it was Great Britain's goal to show off its industrial prowess and sophistication on a world stage. Designed by Sir Joseph Paxton, the grand Crystal Palace was constructed from iron frames and 1 million feet of glass. It housed more than 13,000 exhibits and accommodated more than 6 million visitors to the exhibition that came to see new inventions, such as the power loom, tools, kitchen appliances and an envelope machine. Originally built in Hyde Park in London, it was moved and reconstructed in Sydenham Hill in South London to house sporting events. A fire destroyed Crystal Palace on Nov. 30, 1936.