Here, you are at the foot of this astonishing building on the outskirts of London's financial district. Its unusual curved shape has earned it the nickname Walkie-Talkie. Quite original, isn't it? As its name suggests, this London building actually has an indoor garden made up of all sorts of plants, including ferns and even palm trees! Located on the 37th floor, this garden designed by Rafael Viñoly is of course the highest in the English capital. A must-see, especially as it offers a 360° view of the whole city!