The building of this house took longer and was a lot more expensive than a normal house of this size. The foundations alone required 200m³of concrete. The house is not the only attraction of the Centre – the worlds longest plank can also be found here (it is 36.83m long, weighs 1.1 tons and is registered in the Guinness Book of Records). The Nobel Laureate Lech Walesa’s table is also here.