One of the largest domes in the world, the Pantheon, is made of concrete. You saved a lot of money building this dome with concrete. But remember: concrete is very heavy. About halfway down the ...

Over time, it was consecrated as a Christian church called Santa Maria ad Martyres ... It is still the largest unreinforced concrete dome in the world, a record it has held for nearly two thousand ...

It will take a lot of iron chains and money to keep your heavy concrete dome from collapsing. Besides, there's an easier -- and less risky -- way to build a dome this tall today. Try again!