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https://youtu.be/Bz4cSOy0hMU

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The Lincoln Memorial Reflecting Pool was designed by Henry Bacon, and was constructed in 1922 and 1923, following the dedication of the Lincoln Memorial. It is approximately 2,029 feet (618 m) long (over a third of a mile) and 167 feet (51 m) wide. The perimeter of the pool is therefore 4,392 feet (1,339 m), about 0.83 miles around. It has a depth of approximately 18 inches (46 cm) on the sides and 30 inches (76 cm) in the center. It holds approximately 6,750,000 U.S. gallons (25,500,000 L) of water

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The Air and Space museum gives facts about the celebration of the 50th anniversary of the Apollo missions which includes the first moon landing. The Air and Space museum collects artifacts of aviation and space. The museum also has art work about the space work.

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Within weeks of the pool's reopening in 2012, it had to be drained and cleaned at a cost of $100,000 due to algae in the pool. The algae growth was so extensive it almost completely covered the surface of the pool.[7] Using an ozone disinfectant system installed during the renovation,[8] the National Park Service said it would double the amount of algae-killing ozone in the pool to control future outbreaks.[7]

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Using funding from the American Recovery and Reinvestment Act of 2009, the National Park Service reconstructed the Lincoln Memorial Reflecting Pool. The pool's water supply system was updated to eliminate stagnant water by circulating water from the Tidal Basin; the pool was formerly filled using potable water from the city. Paved walking paths were added to the north and south sides of the pool to replace worn grass and to prevent further erosion.[4] Construction on the 18-month, $30.74 million project began in November 2010. In May 2011, workers began sinking the first of 2,113 wood pilings into a 40-foot deep layer of soft, marshy river clay and some dredged material atop bedrock to support a new pool.[5] The pool reopened on August 31, 2012. The project was managed by the Louis Berger Group.[6]

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When the monument was under construction in 1854, the Washington National Monument Society ran out of money and the project ground to a halt. Twenty-five years later, the U.S. Government took over and completed the upper two-thirds of the structure by 1884 using marble from a different quarry.

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How tall is the monument?
555 feet and 5 1/8 inches tall. It is 55 feet wide at the base.

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Why does the color change on the outside of the monument? Washington National Monument Society ran out of money and the project ground to a halt. Twenty-five years later, the U.S. Government took over and completed the upper two-thirds of the structure by 1884 using marble from a different quarry.

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The Lincoln memorial was built to honor the 16th president,this memorial is located on the western end of the National Mall.

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The natural history museum contain the most biggest natural history collection in the world.

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The long grassy mall contains the Washington Monument, The Lincoln Memorial and many museums you could go in like the natural history museum, the American history, and the air and space museum.