Sir Christopher Wren's iconic masterpiece was a radical break from tradition when it was rebuilt after the Great Fire of London.
Paris: Basilica of Saint-Denis
This magnificent basilica is the resting place of most French kings and queens. Louis XIV, Catherine de Medici and Marie Antoinette are among the royals buried here.
Gloucester Cathedral
One of England's great ecclesiastical buildings, Gloucester Cathedral boasts picture-perfect cloisters, a tranquil garden and some of the finest stained glass in the country.