https://turismoitaipu.com.br/en/
Get the "special tour" which takes you inside the dam. An absolutely incredible spot and incredible achievement. They will take you into a room with a turbine shaft that's mechanically transmitting 700 MW of power.
Expect potential weirdness though. My wife was wearing a (not particularly short) skirt, and the lady at the office selling tour tickets made her step back and spin around, then said she couldn't go in like that. There is a gift shop that sells dam branded pants, so she bought a pair and we were cleared to go in. After all that, one dude in the control room was watching soft-core porn on one of the control room computers.
The turbine shaft room is especially crazy, since they let you (at least back then) walk right up to a few inches away from the shaft mechanically transmitting 700 MW of power! You could reach out and touch it, but we didn't and I wouldn't recommend it.
I've noodled with the idea of starting a "fieldtrips for grownups" group but I feel like a wastewater treatment plant is more likely to open their doors for a group of third graders than a group of thirty somethings.
Probably true. Usually. Just keep your eyes on local news, and wait 'till the Sewer Dept. is facing budget cuts, or needs a rate increase to pay for long-delayed repairs, or is trying to get a millage passed.
Source: My father was a 35 year veteran of the fire department in a large city.
It answered a lot of the "what can Brown do for you" question in a way that no commercial could ever do. Their drop shipping and picking/packing facilities are impressive too including their cold storage areas that are massive warehouse sized freezers.
Also learned that the Louisville airport is listed as an international airport solely because of UPS.