Saint Isaac's Cathedral is a prominent landmark located in Saint Petersburg, Russia. Completed in 1858, it is one of the largest cathedrals in the world, known for its stunning neoclassical architecture and massive golden dome, which rises 101.5 meters high. The cathedral was designed by the architect Augustus Montferrand and features intricate mosaics, beautiful frescoes, and impressive columns. The cathedral serves as a museum today, showcasing its rich history and artistic treasures. Visitors can climb to the colonnade for panoramic views of Saint Petersburg. Saint Isaac's Cathedral is a symbol of the city and a testament to its cultural heritage.