X7G9+XR Petrogradsky District, Saint Petersburg, Russia
The guardhouse was built in 1822 under the direction of the famous architect Rossi. This building, designed as a park pavilion, housed the security for Yelagin Island. Inside, this small building contained two rooms — one for officers and one for the guard soldiers.

After the fire in 1828, the building was rebuilt in its original form by the well-known architect Charlemagne. In 1886-1888, architect Semenov carried out a major renovation of the building, increasing its volume and partially altering the decor. During the Soviet era, the guardhouse was used as a milk buffet. In 1996, the building burned down again and has not been restored since.
Sources:
https://www.citywalls.ru/house7529.html
https://elaginpark.org/central-park/dvortsovo-parkovyy-ansambl/pavilony/
Elagin Island St., 5, Saint Petersburg, Russia, 197183
1st Elagin Bridge, 1, Saint Petersburg, Russia, 197183
Glavnaya Alley, 6, Saint Petersburg, Leningradskaya, Russia, 197183
1st Elagin Bridge, 2, Saint Petersburg, Russia, 197183
Glavnaya Alley, 7, Saint Petersburg, Leningrad Region, Russia, 197183
X7G9+JC Petrogradsky District, Saint Petersburg, Russia
Elagin Island, 4, Saint Petersburg, Russia, 197110
Primorsky Ave., 32A, Saint Petersburg, Russia, 197183
Primorsky Ave., 32A, Saint Petersburg, Russia, 197183
Elagin Island St., 8, Saint Petersburg, Russia, 197183
Elagin Island St., 10, Saint Petersburg, Russia, 197183