Sebastian Lague did a pretty cool series on implementing A* and I thought it would be fun to integrate it with Unity's tile map system. I also wanted to try making it work from an isometric perspective like Diablo 2. The pathfinding takes the stairs into account, which separates the grid into three different "heights". You can also see a bot wandering around in the background.
https://www.youtube.com/watch?v=-L-WgKMFuhE&list=PLFt_AvWsXl0cq5Umv3pMC9SPnKjfp9eGW
A* using isometric tilemap.