architecture buildings cheesegrater crane Gherkin London modern river structure thames water bridge capital city England english Great Britain landmark office skyline skyscrapers tourist attraction urban walkie-talkie.gherking aluminium block building futuristic glass gray grey iconic iron metal offices power ribbed ribs silver skyscraper steel tower abstract abstracted abstraction backdrop background black cheese cheese-grater circle circles circular close close-up closeup form forms free grater green hole holes image macro metallic pattern photo photograph picture reflect reflected reflection reflections resource round shape shapes somadjinn stock textural texture textured UP white alert caution danger dangerous design distorted distortion distortions graphic graphical hazard hazardous message red sign symbol warning