St. Isaac’s Cathedral is the largest Orthodox basilica in St. Petersburg, built between 1818 and 1858 by French-born architect Auguste Montferrand and named for St. Isaac of Dalmatia, patron saint of Peter the Great. Converted from a working church into a museum in 1931, the cathedral can hold up to 12,000 people beneath its soaring 101.5-meter dome.
The interior blends late classicism with Byzantine and neo-Renaissance touches, decorated with semi-precious stones gathered from across Russia along with mosaics and paintings by leading 19th-century Russian artists. A separate ticket allows visitors to climb roughly 260 steps to the 43-meter colonnade, which offers one of the best panoramic views over the city’s rooftops and canals.
Most visitors spend 1 to 2 hours between the cathedral museum and the colonnade climb. The museum is open daily 10:30am to 6pm (closed Wednesdays), and from May through September the colonnade also opens for evening viewing from 6pm to 9:30pm during the White Nights.
When planning your St. Petersburg travel guide or comparing verified attractions and museums in St. Petersburg, pair this stop with standout local spots including State Hermitage Museum, Russian Railways Museum, Stroganov Palace, and Four Seasons Hotel Lion Palace St. Petersburg (0.1 km away).
