This incredible Cathedral was dedicated to St Paul back in 604AD and the gleaming white domes has been an impressive mark on the London skyline ever since. The inside is spectacular, with mosaics covering the ceiling, stained glass windows letting in splashes of colored light and a fantastic organ played during religious ceremonies. Prince Charles and Princess Diana were married here, even though most royal weddings are held in Westminster Abbey.
St Pauls Cathedral is one of the best known Cathedrals in the world and its no wonder why. The architecture itself will leave you wondering how they could of built something so majestic back then. And be sure to walk to the Whispering Gallery. If you whisper into the wall, anyone leaning against it can hear exactly what you're saying. I bet it was put to great use during church ceremonies throughout the ages!