Rotating Car Parks in Seoul
It seems obvious to say this, but there's not much space in Seoul. That's why buildings rise up to 20 or 30 stories high, and why the subway at rush hour has more bodies packed into it than you ever previously thought possible.
So where do people park their cars in this city? Well, as well as numerous underground car parks, another solution to car parking is a rotating car park. The car is driven onto the platform on the ground, and then the whole thing rotates like a ferris wheel, lifting the car up inside for safe storage until you want to bring it back down again later.
What you can see above is the skeleton of one such car park, before they had finished building. It looks like they can park six cars in that thing. Pretty cool.