Saint Isaac's Cathedral

Saint Isaac’s Cathedral is a large 19th-century cathedral in central St. Petersburg, designed and built by the architect Auguste de Montferrand between 1818 and 1858. It is noted for its massive gilded dome and grand classical exterior.

The richly decorated interior features high columns, extensive frescoes and ornamental stonework including malachite and lapis accents used in altarpieces and furnishings. A public colonnade around the dome provides an observation platform with panoramic views across the city.

Originally the city’s principal cathedral, the building was converted into a museum during the Soviet era and remains both a museum and a place where religious services are occasionally held. Conservation and display work preserve its 19th-century decoration and structural features.

The cathedral is located near the Neva River in central St. Petersburg, within walking distance of other major landmarks such as the Admiralty and Palace Square.

• Construction dates and dome height: Construction spanned 1818 to 1858 under architect Auguste de Montferrand, and the cathedral's dome reaches over 100 metres in height.

What to See #

• Interior nave and sanctuary: The main nave and sanctuary contain large columns and richly decorated altars with extensive use of marble, malachite and semi-precious materials from the 19th-century refit.
• Colonnade viewing platform: The external colonnade around the dome provides an observation platform with panoramic views over central St. Petersburg and the Neva River.