St isaac's cathedral is the cathedral in st peterburgs, its is 101.5 metres. it in 1858. it 40 years to build it. there are many pictures and statues the cathedral. there are many pictures and buildings it. ypu can climb the of the cathedral and from there can see vere beatiful of st petersburg. вставте слова : inside,sight,took,was,built,top,biggest,height,outside