List of tallest buildings and structures
The world's tallest artificial structure is the Burj Khalifa in Dubai (of the United Arab Emirates). The building gained the official title of "Tallest Building in the World" and the tallest self-supported structure at its opening on January 9, 2010. The second-tallest self-supporting structure and the tallest tower is the Tokyo Skytree. The tallest guyed structure is the KVLY-TV mast.
List of tallest buildings and structures in London
The history of tall structures in London began with the completion of the White Tower, a part of the Tower of London, in 1098. The first structure to surpass a height of was the Old St Paul's Cathedral. Completed in 1310, it stood at a height of . St Paul's was the world's tallest structure until 1311, when its height was surpassed by Lincoln Cathedral in Lincoln. It regained the title when the spire of Lincoln Cathedral fell in 1549. Although the spire of the Old St Paul's was destroyed by lightning in 1561, it still stood as the tallest structure in London, while the world's tallest structure became Strasbourg Cathedral in Strasbourg, France. St Paul's was severely damaged by the Great Fire of London in 1666. The title of the tallest structure in London passed to Southwark Cathedral, which stands at a height of and no structure in London again rose above 100 metres until 1710, when the current St Paul's Cathedral was completed. At , the cathedral remained London's tallest building until it was overtaken in 1962 by the BT Tower, which was topped out in 1964 at and officially opened in 1965.