Sir Christopher Wren’s 300-year-old architectural masterpiece is a London icon. Towering over diminutive Ludgate Hill in a superb position that's been a place of Christian worship for more than 1400 years (and pagan before that), St Paul’s Cathedral is one of London’s most magnificent buildings. For Londoners, the vast…

The world’s largest and oldest continuously occupied fortress, Windsor Castle is a majestic vision of battlements and towers. Used for state occasions, it’s one of the Queen’s principal residences; when she’s at home, the Royal Standard flies from the Round Tower.

Made up of Great Britain and Northern Ireland, the United Kingdom may not always seem very united - indeed, Scotland came close to voting for independence in 2014. Yet this historic state is packed with appeal for the visitor, from pulsing cities to stunning countryside. England, Scotland, Wales and Northern Ireland are…