Again shows what you can do with lidar images. I'm not sure how widely they are publicly available but if you can get lidar footage of an area you (think) you know definitely check it out. There's a lot of man-made things to discover.
E.g. here's a little story from my area: we were on a walk once and someone pointed to a certain plant which is known to only thrive on very limey soil. And acoording to her used in the past by people as indicator for figuring out where they could get lime for making mortar. Nothing special to see though. A couple of months later, unrelated, a geologist showed lidar images of that area and in a spot close to where said plant was found, there was obvisouly a quite huge round sink in the terrain. Turns out this was once, many centuries ago, essentially a lime mine (which the geologist knew because of history). Nice how history, biology, geology can all come together like that. Yet if you don't know it it's pretty much invisible. Sattelite also doesn't give even the slightest hint. But with a height model and applying some shade it suddenly becomes quite obvious.