The imposing Dome of St. Paul's Cathedral has been a symbol of London not least during the blitz of the second world war when it stood framed by the fires raging in the city. A church has stood on the site since the 7c. and the present building, a masterpiece of Christopher Wren, was completed in 1708 after 32 years of work. The impressive interior contains mementos and monuments to many of Britain's heroes including Nelson, Wellington and Churchill. The famous Whispering Gallery is well worth the climb.