...And if you do that, take the time to stop at the Holy Family Shrine at the top of the hill on the south side of the road near Gretna (south and then east of the truck stop on the south side of the interstate. A spring runs from the altar into a fountain in the visitors' center... Very cool.
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We drove thru Omaha a lot one summer and I finally had to stop and see WTF that place was. It was one of the odder places I've been in my life. Maybe it was because it was getting dark, but I kinda felt glad to leave. And not just Omaha