4. The Chicago Sky-deck
Until 1996, Chicago’s Willis Tower had been the world’s tallest office building. Being inclusive of 110 storeys, the view from the tower is nothing less than having a bird’s view. Reimagine floating in the sky, or flying, and enjoying impeccable views like a bird. The sky deck is an observation area, and a part of the Willis Tower. from this, a ledge protrudes. Built of entirely glass, the ledge is a glass block with all six sides transparent. Tourists can look directly at the city underneath and enjoy the most wonderful view from 1353 feet above the ground.