• National Air and Space Museum, Washington, D.C., U.S.

Attendance 2016: 7,500,000

Located in the National Mall in Washington, D.C., the National Air and Space Museum holds the largest collection of historic aircraft and spacecraft in the world. Established in 1946, it is a center for research into the history and science of aviation and spaceflight, as well as planetary science and terrestrial geology and geophysics. The museum displays thousands of objects such as the 1903 Wright Flyer, Charles Lindbergh's Spirit of St. Louis, the Apollo 11 Command Module Columbia and a lunar rock which you can touch. Almost all space and aircraft on display are originals or the original backup craft.

• National Museum of Natural History, Washington, D.C., U.S.

Attendance 2016: 7,100.000

Located also in the National Mall in Washington, D.C., United States, the National Museum of Natural History is a natural history museum administered by the Smithsonian Institution. Opened in 1910, the museum was one of the first Smithsonian buildings constructed exclusively to hold national collections and research facilities. The museum's collections contain over 126 million specimens of plants, animals, fossils, minerals, rocks, meteorites, human remains, and human cultural artifacts.

• Shanghai Science &Technology Museum, Shanghai, China

Attendance 2016: 6,316,000

The Shanghai Science &Technology Museum is located in the Pudong District of Shanghai, China, close to Century Park, the largest park within the inner districts of the city. It serves the purposes of education, research, leisure traveling, cooperation, communication, collection and production. The museum has 13 permanent exhibitions including World of Animals, Spectrum of Life, Spider Exhibition, Earth Exploration, Cradle of Designers, Children's Science Land, Light of Wisdom, Home on Earth, Information Era, World of Robots, Light of Exploration, Human and Health, and Space Navigation.