A glut of planned tall buildings is set to change the skyline of the British capital.
Until the early 1960s, St. Paul's Cathedral was the tallest building in London. For a while, it was illegal to build anything higher than 80 feet, after a 12-story building blocked Queen Victoria's views from Buckingham Palace. But things are quickly changing: There are now 200 skyscrapers over 20 stories high under construction in the city. A new exhibition aims to help Londoners see what the city skyline might look like in 20 years.