St. Paul's Cathedral
Architect: Sir Christopher Wren
Year Completed: 1710
With one of the world's most recognizable domes, St. Paul's is an iconic structure in the City of London. Designed by Sir Christopher Wren, an architect responsible for 52 churches in London, St. Paul's was completed in 1710 and remained the tallest building in London until 1962. The Cathedral remains the second largest church in the United Kingdom, and its Geometric Staircase was featured in both the 2009 Sherlock Holmes and Harry Potter and the Prisoner of Azkaban films.