City of London skyscrapers and the Tower of London viewed across the River Thames, London, England, United Kingdom, Europe

color image horizontal travel destinations travel outdoors day london capital cities england uk tower of london international landmark famous place history castle fortress built structure architecture skyscraper building city urban scene 30 st mary axe the gherkin neo futurism office building river thames river water flowing water skyline cloud modern tree no people skyscrapers high rise high rises high rise high rises buildings cities urban rivers nobody no one no person historic fort forts fortresses daytime castles fortified fortification travel destination tourist destination tourist destinations