Many uses for this hilly house in Poland: In the summer, you can host Slip 'n Slide races. In the winter, you have a bunny slope. And year-round, you have a clandestine Batman-style hideout for your car.
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That might not have been what the art collector homeowner was going for, but he hit the jackpot with the long, lush roof. The huge garage is obscured under the verdant expanse of moss, and they must have around 25 cars because that thing is Wal-Mart parking garage big. The entrance looks like it's just another part of the house—which is exactly the seamless look they were going for. They just didn't expect all the awesome slopey side-effects. [Design Boom]