London was built on clay so it was harder to build high than in New York, which stands on rock. For many years the tallest architects could construct a skyscraper was 5 - 600 feet. Then new technology allowed them to build higher and London’s tallest building is currently The Shard next to London Bridge, which is over 1000 feet tall. One Undershaft in The City was built to match The Shard in height and it too will have a viewing tower with an education centre operated by the recently renamed London Museum (formerly Museum of London).

St. Paul’s Cathedral is one of London's most famous landmarks, its majestic dome visible from many parts of the capital. This architectural masterpiece - a symbol of London’s strength and resilience - and has been the site of many historic occasions, including royal weddings and state funerals. It is a working church and a place for quiet reflection, but there are also many wonderful things to see inside on a visit. Blue Badge Tourist guide Patricia Gentry shares just a few of her favourites below.