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National Museum of Natural History
The National Museum of Natural History is a natural history museum administered by the Smithsonian Institution, located on the National Mall in Washington, D.C., United States. It has free admission and is open 364 days a year. In 2016, with 7.1 million visitors, it was the eleventh most visited museum in the world and the most visited natural history museum in the world. Opened in 1910, the museum on the National Mall was one of the first Smithsonian buildings constructed exclusively to hold the national collections and research facilities. The main building has an overall area of 1.5 million square feet with 325,000 square feet of exhibition and public space and houses over 1,000 employees.
Unknown stone (possibly emerald) at the Janet Annenberg Hooker Hall of Geology, Gems, and Minerals. 
Leatherback Turtle Skeleton.
Rock formation exhibit at the museum. 
Skeleton comparison of various cat and dog species.
African Bush Elephant displayed at the museum. 
An Egyptian coffin displayed at the museum.
A mummy exhibit at the museum. 
Various precious stone jewelry displayed at the museum.
Skeleton of a gray whale. 
Unknown skeleton display at the museum.
African Bush Elephant displayed at the museum. 
Couple of fluorescent minerals displayed at the museum.
A child mummy display at the museum. 
The 45-carat Hope Diamond at Smithsonian Museum of Natural History valued at $250,000,000.
National Air and Space Museum
The National Air and Space Museum of the Smithsonian Institution, also called the Air and Space Museum, is a museum in Washington, D.C. It was established in 1946 as the National Air Museum and opened its main building on the National Mall near L’Enfant Plaza in 1976. In 2018, the museum saw approximately 6.2 million visitors, making it the fifth most visited museum in the world, and the second most visited museum in the United States. The museum contains the Apollo 11 Command Module Columbia, the Friendship 7 capsule which was flown by John Glenn, Charles Lindbergh’s Spirit of St. Louis, the Bell X-1 which broke the sound barrier, the model of the starship Enterprise used in the science fiction television show Star Trek: The Original Series, and the Wright brothers’ Wright Flyer airplane near the entrance.
National Air and Space Museum Estimated Location: 38.887914, -77.019909
An airplane cockpit exhibit at the museum. 
Ford 5-AT Tri-Motor displayed at the museum.
Viking Lander exhibit at the museum. 
Rocket exhibit at the museum.
USS Enterprise Aircraft Carrier model exhibit at the museum. 
Frontier Airlines Boeing 727 static model exhibit at the museum.
Source:
Images property of Chromoscience.
https://en.wikipedia.org/wiki/National_Air_and_Space_Museum
https://en.wikipedia.org/wiki/National_Museum_of_Natural_History
