Amazing Architecture: The Gherkin, London

Nicknamed the Gherkin for its unique round, tapered shape, the office tower at 30 St Mary Axe in London’s financial district opened in 2004. Despite its appearance, there is only one piece of curved glass on the entire building, a lens-shaped piece that caps the very top. The tower reaches nearly 600 feet high, and its 40 stories house insurance companies and other financial businesses.