20th centuries The final design of Nevsky Prospekt as an avenue-ensemble took shape in the first third of the 19th century. At this time, the masters of high classicism were creating. In 1799, a competition was announced for the construction of a cathedral on the site of the Church of the Nativity of the Virgin, which was won by the former serf of the Stroganov counts, Andrey Voronikhin. Kazan Cathedral was built from 1801 to 1811 and was consecrated on 15 September 1811, and in 1813 was buried under its vaults Field Marshal Mikhail Kutuzov. On 29 December 1837, the opening of monuments to Kutuzov and Barclay de Tolly to the generals Michael Andreas Barclay de Tolly and Mikhail Kutuzov on the square in front of the cathedral, created by the sculptor Boris Orlovsky. In 1806–23, the Admiralty was rebuilt. At the same time, work was underway to improve the surrounding areas. In 1816–1818, a boulevard into three alleys was laid out on the site of a moat and a rampart. At the same time, ensembles appeared, designed by architect Carlo Rossi. The ensemble Palace Square connects to Nevsky Prospekt through the Triumphal Arch General Staff Building. Another Rossi ensemble at Arts Square connects with the main highway, Mikhailovskaya Street. The third ensemble, Ostrovsky Square, is open to Nevsky Prospekt and is an integral part of it. The first buildings of the ensemble appeared in 1816–18, two light pavilions with sculptures of warriors in armor, connected by a fence of strict design. In 1828–32, Rossi added a huge (90 meters long) new building to the building of the Public Library, creating a harmonious whole structure. At the same time, the Alexandrinsky Theater was being built at the back of the square. The theater building was one of the best for its time in terms of planning, stage equipment and skill of external and internal decoration. In the 1830s, artist Vasily Sadovnikov made a series of lithographs depicting both sides of Nevsky Prospekt from Admiralteyskaya Square to Anichkov Bridge, known as the "Panorama of Nevsky Prospekt" (1830–1835). Made in watercolors, almost 16 meters long, it was translated into lithographic stone and published by A.M. Prevost in a series of 30 sheets. By order of Emperor Paul I in 1800, two boulevards were created along Nevsky Prospekt in the section from Moika to Fontanka. In 1802–1803 they were replaced by one boulevard