Saint Isaac's Cathedral.
St. Isaac's Cathedral was originally the city's main church and the largest cathedral in Russia. It was built between 1818 and 1858, by the French-born architect Auguste Montferrand, to be one of the most impressive landmarks of the Russian Imperial capital. One hundred and eighty years later the gilded dome of St. Isaac's still dominates the skyline of St. Petersburg. Although the cathedral is considerably smaller than the newly rebuilt Church of Christ the Savior in Moscow, it boasts much more impressive fades and interiors.