http://upload.wikimedia.org/wikipedia/commons/7/78/Svampen_Orebro.jpg
This is a watertower in Örebro Sweden. It is fashinating - I think - to read about how it was built. It is called The Mushroom
The Mushroom was built during 1956-58.
They started moulding the waterreservoir "the hat" in a wooden form on the ground.
It weighs 3200 tons. Thereafter the hat was lifted up gradually with help of 32 hydrolic (?) jackscrews and then the "foot" was moulded from below.
The growth was about 58 cm (1.9 foot)per 24 hours.
Vattenreservoaren är 45,5 meter i diameter, medan tornets nedre del vid markytan mäter 10,5 meter i diameter. Det finns två hissar upp till altanen. Det finns också en nödtrappa bestående av 300 trappsteg.[2]