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The Adler Planetarium is a must-visit spot for astronomy enthusiasts and those interested in space exploration. Founded by philanthropist Max Adler in 1930, it was the first planetarium built in the Western Hemisphere and remains the oldest. The planetarium boasts three full-size theaters, including the Sky Theater planetarium, where visitors can enjoy various shows and presentations about the night sky. The Sky Theater projector can recreate every aspect and movement of the night sky, giving visitors an incredibly realistic experience. The Definiti Space Theater, an addition made in 1999, comes equipped with a digital full-dome video environment for an immersive experience. Visitors can also enjoy sculptures outside the planetarium, such as the "Man Enters the Cosmos" sundial and a statue of renowned astronomer Nicholas Copernicus. The lobby's dedication plaque is also a work of art, depicting the gods and goddesses that represent each planet, except for Pluto, which had yet to be discovered at the time of the plaque's creation.

The Willis Tower, previously known as the Sears Tower, is in downtown Chicago. Completed in 1974, it is a 108-story building that held the title of the tallest building in the world for nearly 25 years. It remains the tallest building in the United States. The Skydeck, located on the 103rd floor, is the building's observation deck, approximately 1,353 feet above the ground. It is one of Chicago's most popular tourist attractions, welcoming about 1.3 million visitors annually. Recently, renovations have introduced new glass balconies with floors extending four feet over the street. The balcony provides stunning views of Illinois, Lake Michigan, and neighboring states Indiana, Michigan, and Wisconsin on a clear day.