UK- London

How about?

Day trip - Piccadilly Circle including Buckingham Palace, Trafalgar Square, etc

And don't miss if you have time - Hyde Park, Big Ben, Walk along Thames, Cruise in Thames, Walk over the ped bridge over Thames, Westminister Abbey

Evening trip - London Eye for Giant Wheel

Day Trip - Madame Tussauds for Wax Museum

Attractions Map

How to reach London downtown from Heathrow Airport?

Places to visit in London for a short stay of 1-3 days:

The Tower of London

St Paul's Cathedral

The London Eye

Buckingham Palace

Tower Bridge

Trafalgar Square

Piccadilly Circus

Westminster Abbey

Downing Street

Horse Guards