St. Isaac's Cathedral is the third largest domed cathedral in the world after St. Peter's in Rome and St. Paul's in London. It was built within 40 years (1818-1858, architect A. Montferrand). It is one of the finest monuments of the XIX century, formerly principal cathedral of the Russian capital, the largest cathedral in town able to accommodate about 14,000 audiences. The cathedral is graced with 112 solid granite columns weighing up to 114 tons each, and about 400 relieves and bronze sculptures. Its interiors are adorned with gold trim, mosaics, 14 kinds of marble, malachite, lapis lazuli and paintings. If it is a clear day we recommend climbing to the dome's top; the panoramic view is absolutely worth the effort.