4. The Gherkin
Locate at 30 St. Mary Axe and standing tall at 590 ft., this 40-floor smartscraper was completed in 2003, and is a combination of beauty and brains.
The unique curvature makes this a one-of-a-kind design. It is a high-performance building that incorporates the smart use of light. Its outer frame is a curved diameter so you get a much wider view.
The Gherkin is a smart building as it automatically adjusts to the weather. This is truly an extraordinary work of architecture. Despite its unique design, the only piece of curved glass is its dome.