Get perspectives on Chicago's most famous structures, just as insider information from a specialist guide, on this engineering-centered voyage. See every one of the main structures on one visit, a tricky to-achieve task by walking. View the horizon from the Chicago River while paying attention to live analysis. Snap photographs of the Willis (Sears) Tower, Old Post Office, 360 Chicago Observation Deck, Wrigley Building, and that's just the beginning.