The Chicago skyline is a distinctive feature of the city, characterized by its impressive collection of skyscrapers. Notable buildings include the Willis Tower, formerly known as the Sears Tower, which was once the tallest building in the world. The skyline showcases a mix of architectural styles, from modern glass structures to historic designs. The skyline is best viewed from locations along Lake Michigan or from various vantage points within the city. It is particularly striking at sunset when the buildings are illuminated against the colorful sky. The skyline is a symbol of Chicago's economic strength and architectural innovation.