The Sky Deck is an observation deck located on the 103rd floor of the Willis Tower in Chicago. It offers stunning panoramic views of the city and its surroundings, allowing visitors to see up to 50 miles on clear days. The deck features glass boxes that extend out from the building, providing a unique experience of standing over the city below. Visitors can access the Sky Deck through the Willis Tower Skydeck entrance, which includes an interactive exhibit about the history of the tower and the city. The attraction is popular among tourists and locals alike, making it a must-visit destination in Chicago.