What are the most interesting or unusual training loops you have near you, or that maybe you've run when living/staying elsewhere?
My city is split in two by a natural escarpment, so there's some converted rail trails that have unique elevation attributes for training. One of them steadily rises at a non-stop 3% grade for almost 5 miles. I've used if for hard uphill tempos many times.
What do you all have near you that makes for a unique or interesting training loop?