It's "Chicago Henge" - when the sun lines up with our beautiful skyline, beaming down between the skyscrapers in the heart of the Loop. This happens on the first day of spring and autumn.

Chicago is glowing with the launch of Big Bus Tours' Sunset Live Tour season, just in time to celebrate a decade of rolling through the Windy City.

See every worthy Chicago landmark in 30 minutes on Seadog ... you could do worse than watching the sunset against the skyline aboard this 2.5 or 3-hour Lake Michigan brunch, lunch, or dinner ...