Recently my kids and I took a memorable trip with friends to see an "underwater city," or at least what is left of it.
Close to where we live is a city called American Falls. In the 1920's a dam was built, which required about 85% of the population to be relocated. In fact, American Falls was the first city in the U.S. to be entirely relocated (ref).
In the fall, when the reservoir waters are low, much of the old city is exposed.
So we went to explore, and it was cool.
My favorite part was the old sidewalks you could walk down. The sidewalks intersected through the old town.
It was odd to walk down the old sidewalks and see the remnants of beautiful tree-lined streets.
And now, 100 years later, the stumps remain.
Here you can see the date of 1916.
Fascinating trip that did not disappoint.