Skydeck 88 is an observation deck located on the 88th floor of the Willis Tower, formerly known as the Sears Tower, in Chicago. It offers stunning panoramic views of the city and its surroundings, making it a popular tourist attraction. Visitors can see landmarks such as Lake Michigan and the Chicago River from this height. The deck features a glass box called "The Ledge," which extends out from the building, allowing guests to stand over the city below. Skydeck 88 is accessible via high-speed elevators and provides educational displays about Chicago's history and architecture.