Cahokia Mounds State Historic Site
FreeClimb 100-foot Monks Mound and walk trails among the earthworks of an ancient Mississippian city.

Photo: Schwerdf, CC BY 4.0, via Wikimedia Commons. Cropped and resized.
Next to Route 159, just south of downtown Collinsville · Collinsville, IL
This 170-foot water tower was built in 1949 by the W.E. Caldwell Company for the G.S. Suppiger plant that bottled Brooks catsup. Volunteers saved it from demolition and restored it in 1995, and it joined the National Register of Historic Places in 2002 as a prime example of mid-20th-century novelty architecture. You see it beside Route 159 just south of downtown Collinsville, and each June the town holds a festival in its honor.
General sightseeing guidance
Habits that pay off across this whole category, not rules for this one venue. Always check the official site for the specifics.
The forecast is part of the ticket
Haze, low cloud, and rain flatten a view. Clear-day visits are worth rearranging your plans for.
Golden hour sells out first
Sunset slots at observation decks and cruises are the first to go, so book those further ahead.
Dress a layer warmer
It is always breezier up high and out on the water than it feels at street level.
Timed entry is common
Plenty of landmarks release tickets in windows rather than at the door, so check before you walk over.
The closest stops to World's Largest Catsup Bottle, ordered by straight-line distance. A few more like it, plus some different kinds of fun so you can build a full day.
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