Collect information and pictures about a famous place in a big city of your country

saint isaac's cathedral  or  isaakievskiy sobor  in  saint petersburg is the largest orthodox basilica and the fourth largest cathedral in the world. it is dedicated to  saint isaac of dalmatia, a  patron saint  of  peter the great, who had been born on the  feast day  of that saint.

the church on  st isaac's square  was ordered by  tsar  alexander i, to replace an earlier  rinaldiesque  structure, and was the fourth consecutive church standing at this place.

the  neoclassical  exterior expresses the traditional russian-byzantine formula of a greek-cross ground plan with a large central dome and four subsidiary domes. it is similar to  andrea palladio's  villa la rotonda, with a full dome on a high drum substituted for the villa's low central saucer dome. the design of the cathedral in general and the dome in particular later influenced the design of the  lutheran cathedral  in  helsinki.

the exterior is faced with gray and pink stone, and features a total of 112 red granite  columns  with  corinthian  capitals, each hewn and erected as a single block: 48 at ground level, 24 on the rotunda of the uppermost dome, 8 on each of four side domes, and 2 framing each of four windows. the rotunda is encircled by a walkway accessible to tourists. 24 statues stand on the roof, and another 24 on top of the rotunda.

the cathedral's main  dome  rises 101.5 metres (333  ft) and is  plated  with pure gold. the dome is decorated with twelve  statues  of angels by josef hermann. these angels were likely the first large sculptures produced by the then novel process of  electrotyping, which was an alternative to traditional bronze casting of sculptures. montferrand's design of the dome is based on a supporting  cast iron  structure. it was the third historical instance of cast iron  cupola  after the  leaning tower of nevyansk  (1732) and  mainz cathedral  (1826).

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