Our Pick
Posted on @rawstates
Chicago River reversed
1900
Sanitary and Ship Canal, Chicago
ajay_suresh · CC BY 2.0 · Wikimedia Commons
The Sanitary District cut a 28-mile canal that permanently reversed the river's flow away from Lake Michigan, the largest earth-moving project of its time.
That was 1 of the hidden places.
Location: approximate area
This place has its own thread on r/rawstates
Read what people are saying about it, or add your own.