The Trinity-Izmailovsky Cathedral is located in the Admiralty district, near the Fontanka River embankment. Its official name is the Cathedral of the Holy Life–Giving Trinity of the Izmailovsky Life Guards Regiment. The height of the cathedral reaches 80 meters, and it is one of the ten tallest churches in Russia. 

The domes of the Trinity-Izmailovsky Cathedral rise above the roofs of St. Petersburg. Excursions to the roofs of houses are very popular in the city. If you climb to any roof in the city center, you will see the beautiful blue domes with golden stars of the Trinity-Izmailovsky Cathedral. People often call it the Trinity Cathedral or Izmailovsky Cathedral.  

Since 1730, Empress Elizabeth signed a decree on the creation of a guards regiment, which was named after the Izmailovo Estate in the Moscow region. Tsar Peter I spent his childhood there and created his first "funny regiment". The barracks of the Izmailovsky regiment are located on the bank of the Fontanka River. A wooden Trinity Church was erected among the barracks. 

In 1824, a devastating flood occurred in St. Petersburg. The wooden church of the Izmailovsky regiment was badly damaged. Since the soldiers of the regiment glorified themselves in many wars, Emperor Nicholas I approved the construction of the large stone Trinity-Izmailovsky Cathedral. The famous Russian architect Vasily Starov built the cathedral in 1828-1835 in the classical style. 

Since the temple was regimental, in addition to icons in the cathedral, you can see the standards of the Izmailovsky Life Guards regiment, various awards and relics. After the victory in the Russian-Turkish War of 1877-1878, a monument in the form of a cast-iron column was erected in front of the Trinity-Izmailovsky Cathedral in 1886. On its top there is a sculpture of Nika, the goddess of Victory. The height of the monument reaches 30 meters.