Kazan Square, 2, Saint Petersburg, 191186
The excitement began when proponents of alternative history noticed paintings by early 19th-century artists, for example,

Fyodor Alekseyev's "View of the Kazan Cathedral in Petersburg," from the Russian Museum collection

Andrey Martynov’s “View of the Kazan Cathedral” from the State Hermitage collection and

Swede Benjamin Patersen’s “Kazan Cathedral from the Nevsky Prospect side”
They attract attention not only because they recreate on canvas accurate views of the city in 1811 and depict the panorama of the Cathedral of the Kazan Icon of the Mother of God (Kazan Cathedral), built in 1811 according to the design of architect A. M. Voronikhin on the site of a small church, but also because they contain a certain mysterious obelisk.
According to reptiloid and Nosovsky supporters, it remained from an ancient city that existed on the site of present-day Saint Petersburg.
Indeed, the history of the obelisk is somewhat interesting. On Voronikhin’s 1810 drawing, not only two colonnades but also two obelisks on the northern and southern sides are depicted.

Source: Plan of Kazan Cathedral and the adjacent blocks and squares. According to the 1810 project. Illustration from the book "Russian Architecture." 1940
The history of the construction of the Kazan Cathedral is a major milestone in the history of St. Petersburg urban art. Built in a very short time, this majestic monument of Russian architecture amazes many generations with its magnificence and beauty. The Kazan Cathedral was built according to the design of architect Andrey Nikiforovich Voronikhin from 1801 to 1811. It was constructed on the site of Nevsky Prospect where a modest Church of the Nativity of the Virgin Mary stood. This church housed one of St. Petersburg’s main shrines — the miraculous icon of the Kazan Mother of God. The cathedral was built by order of Emperor Paul I specifically for this icon, as the cathedral church of Saint Petersburg.
The idea for this cathedral was conceived by Paul I long ago, when he was still heir to the throne. In 1781, Their Imperial Highnesses Pavel Petrovich and his wife Maria Feodorovna traveled under the names Count and Countess of the North (du Nor) from Petersburg on a long journey. The travelers were young and energetic; Pavel Petrovich was then 27 years old, and his wife Maria Feodorovna was 22. Behind them lay the still very small Russian capital by European standards, with mostly wooden buildings and poorly paved streets. At the beginning of Nevsky Prospect, near the Green Bridge over the Moika River, a remarkable brick building stood out above the others — the Stroganov Palace, which still survives today. By the Catherine Canal stood a stone church with wooden domes and a bell tower — the Church of the Nativity of the Blessed Virgin Mary. It was built by the order and at the expense of Anna Ioannovna and consecrated on June 13, 1737. It housed the shrine of the Romanov House and Russia — the Kazan Icon of the Mother of God.
They arrived in the Eternal City on February 12, 1782, five months after the start of their trip. St. Peter’s Basilica in the Vatican was already famous at that time. Its appearance inspired the tsesarevich with the idea of creating a church in Petersburg with the same colonnade, obelisk, and square in front of it. Already as emperor, he designated a place for it on Nevsky Prospect, next to the Church of the Nativity of the Blessed Virgin Mary, which was to be demolished after the new cathedral was built.
And so it was done after his death.
The consecration of the cathedral was timed to coincide with the coronation of Alexander I, which took place on September 15, 1811. But by that time the cathedral was not fully completed, so many of the architect’s plans were not realized: the colonnade of the southern facade was not built, the bell tower was not erected, two bronze angels were made of plaster and then removed from their pedestals without replacement. Similarly, the cast-iron fence and the drinking fountain in front of the cathedral’s entrance portico were left unfinished. A wooden obelisk was installed for the celebration.
At this point, the funds allocated for the project ran out, and Paul’s designs were unpopular with the new emperor, so financing stopped, and the temporary wooden structure remained standing. In 1813, the situation changed: relics of the victory in the Patriotic War were placed in the temple, so the obelisk even proved useful. Moreover, the structure served as a landmark, rising above the low buildings on Nevsky Prospect at that time.
How the obelisk was built is described in the book “Kazan Cathedral. Historical Research on the Cathedral and Its Description” by Andrey Aplaksin.

The obelisk was painted to look like granite and stood until the death of Alexander I; after his death, it was dismantled in 1826 as alien to Orthodoxy, so that the cathedral would less resemble the imitation of St. Peter’s Basilica in Rome.
Therefore, alas, Hyperboreans and reptiloids did not participate in the construction of the cathedral and the obelisk.
Sources:
A. G. Bulakh, By the Will of Reason and Feelings. Saint Petersburg — Helsinki: Two Orthodox Cathedral Churches, — St. Petersburg: Publishing House of St. Petersburg University, 2016
Aplaksin, A. Kazan Cathedral. Historical Research on the Cathedral and Its Description. St. Petersburg: R. Golike and A. Vilborg Printing Partnership, 1911.
Unnamed Road, Saint Petersburg, Russia, 199178
Rubinstein St., 7, Saint Petersburg, Russia, 191025
Griboedov Canal Embankment, 2B, Saint Petersburg, Russia, 191186
Sadovaya St., 2, Saint Petersburg, Russia, 191023
Malaya Morskaya St., 10-4, Saint Petersburg, Russia, 191186
Malaya Sadovaya St., 8, Saint Petersburg, Russia, 191023
Fontanka River Embankment, 2, Saint Petersburg, Russia, 191187
Nevsky Ave., 28, Saint Petersburg, Russia, 191186
Admiralteysky Ave, 12, Saint Petersburg, Russia, 190000
Palace Square, 6, Saint Petersburg, Russia, 191186
Nevsky Ave., 16, Saint Petersburg, Russia, 191186
Nevsky Ave., 39A, Saint Petersburg, Russia, 191023
Nevsky Ave., 39, Saint Petersburg, Russia, 191023
Nevsky Ave., 15, Saint Petersburg, Russia, 191186
Dvortsovaya Square, 2, Saint Petersburg, Russia, 190000
Bolshaya Morskaya St., 20, Saint Petersburg, Russia, 191186
Dvortsovaya Embankment, 2E, Saint Petersburg, Leningrad Region, Russia, 191186
Petrovskaya Embankment, 6, Saint Petersburg, Russia, 197046
Kronverksky Ave, 7, Saint Petersburg, Russia, 197046
Barmaleeva St., 5, Saint Petersburg, Russia, 197136
Admiralteysky Canal Embankment, 2t, Saint Petersburg, Russia, 190121
7th Line V.O., 16-18, Saint Petersburg, Russia, 199034
Nevsky Ave., 72, Saint Petersburg, Russia, 191025
Malaya Morskaya St., 24, Saint Petersburg, Russia, 190000
Millionnaya St., 7, Saint Petersburg, Russia, 191186
2 Zodchego Rossi Street, Saint Petersburg, Russia, 191023
X83G+65 Petrogradsky District, Saint Petersburg, Russia
Universitetskaya Embankment, 17, Saint Petersburg, Russia, 199034
WCV4+84 Krasnogvardeysky District, Saint Petersburg, Russia
Universitetskaya Embankment, 3, Saint Petersburg, Russia, 199034
Angliyskaya Embankment, 76, Saint Petersburg, Russia, 199034
Arsenalnaya Embankment, 7, Saint Petersburg, Russia, 195009
1st Elagin Bridge, 1, Saint Petersburg, Russia, 197183
Nevsky Ave., 18, Saint Petersburg, Russia, 191186
Golitsynskaya St., 1x, Saint Petersburg, Russia, 194362
1 Summer Garden St., Saint Petersburg, Leningrad Region, Russia, 191186
108 Lenin Ave, Saint Petersburg, Russia, 198320
4th Line V.O., 5, Saint Petersburg, Russia, 199034
Kamennoostrovsky Ave., 44B, Saint Petersburg, Russia, 197101
Malaya Morskaya St., 24, Saint Petersburg, Russia, 190000
Odessa St., 1, Saint Petersburg, Russia, 191124
Fermskoye Highway, Building 41, Block 8, Saint Petersburg, Russia, 197341
Fontanka River Embankment, 166, Saint Petersburg, Russia, 190020
Krasnogradsky Lane, Saint Petersburg, Russia, 190068
San-Galli Garden, Ligovsky Ave., 64, Saint Petersburg, Russia, 191040
Ligovsky Ave., 10, Saint Petersburg, Russia, 191036
Ligovsky Ave., 10/118, Saint Petersburg, Russia, 191036
Gorkovskaya, Saint Petersburg, Russia, 197101
4 Kvarengi Lane, Saint Petersburg, Russia, 191060
Spasskaya, Saint Petersburg, Russia
W8F9+X7 Admiralteysky District, Saint Petersburg, Russia
Sennaya Square, 5, Saint Petersburg, Russia, 190031
Brinko Lane, 4, Saint Petersburg, Russia, 190068
Ligovsky Ave., 50, Saint Petersburg, Russia, 191036
pr. Stachek, 108A, Saint Petersburg, Russia, 198207
Nevsky Ave., 35, Saint Petersburg, Russia, 191023
12 Millionnaya St., Saint Petersburg, Russia, 191186
Galernaya St., 60, Saint Petersburg, Russia, 190000