Just Plain Awesome.
I have a lot of respect for fine engineering. It doesn’t matter what field it comes from either as I find there’s an elegance about things that have been so well planned, designed and the implemented. I recently came across this video that show cases the world’s smallest V12 engine, all hand made (apart from the screws). It’s a bit lengthy but I was mesmerized by it, loving the incredible attention to detail and the beauty of something so complex coming together so well.
I think it also plays into my not-so-secret love of steampunk stuff, what with all the elaborate metalwork and interconnecting parts.