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  2. Empire State Building - Wikipedia

    en.wikipedia.org/wiki/Empire_State_Building

    The building was originally a symbol of hope in a country devastated by the Depression, as well as a work of accomplishment by newer immigrants. [248] The writer Benjamin Flowers states that the Empire State was "a building intended to celebrate a new America, built by men (both clients and construction workers) who were themselves new Americans."

  3. List of tallest observation towers in the United States

    en.wikipedia.org/wiki/List_of_tallest...

    Stratosphere Tower: 350.2 m (1149 ft) 1996 Concrete Las Vegas, Nevada: Tallest observation tower in the United States. 2 Tower of the Americas: 228.6 m (750 ft) 1968 Concrete San Antonio, Texas: Built as the theme structure for San Antonio's World's Fair, HemisFair '68. It was the tallest observation tower in the United States from 1968 until ...

  4. List of tallest buildings in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_tallest_buildings...

    Also known as the Nordstrom Tower. At 1,550 feet, the tower is the tallest residential building in the world both by roof height and architectural height. [9] [10] Topped out in September 2019. [11] It is the tallest building outside Asia by roof height. Tallest building constructed in the United States in the 2020s. Willis Tower † Chicago

  5. List of tallest buildings in North America - Wikipedia

    en.wikipedia.org/wiki/List_of_tallest_buildings...

    Tallest building in North America outside of the United States. Tallest skyscraper in Monterrey, Mexico, and Latin America. [44] 28= JPMorgan Chase Tower: Houston: United States 305 (1,002) 75 1982 Tallest building in Houston and Texas; tallest 5-sided building in the world [45] [46] Tallest building west of the Mississippi River until 1989. 28=

  6. Birkeland–Eyde process - Wikipedia

    en.wikipedia.org/wiki/Birkeland–Eyde_process

    The first towers bubbled the nitrogen dioxide through water and non-reactive quartz fragments. Once the first tower reached final concentration, the nitric acid was moved to a granite storage container, and liquid from the next water tower replaced it. That movement process continued to the last water tower which was replenished with fresh water.

  7. Construction of the World Trade Center - Wikipedia

    en.wikipedia.org/wiki/Construction_of_the_World...

    The first tenants moved into the North Tower in December 1970 and into the South Tower in January 1972. Four other low-level buildings were constructed as part of the World Trade Center in the early 1970s, and the complex was mostly complete by 1973. A seventh building, 7 World Trade Center, was opened in 1987.

  8. Baltimore World Trade Center - Wikipedia

    en.wikipedia.org/wiki/Baltimore_World_Trade_Center

    The building was positioned so that a corner points out toward the waters of the Inner Harbor, suggesting the prow of a ship. [8] Perched at the Harbor's edge, the building appears to rise out of the water when viewed from certain vantage points. It presents a frontal plane toward the city, across a broad plaza between the building and Pratt ...

  9. Timeline of nuclear power - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_nuclear_power

    It destroys its containment building and spreads radioactive material across Europe. 1987. On January 7, the N reactor, the last US plutonium production reactor, is shut down at the Hanford Site, Washington. Modifications are begun to improve safety due to the water-cooled graphite-moderated design being shared by Chernobyl Unit 4, but the ...