1. LONDON

2. Union Jack-
the flag of Great Britain, combined of flags of different parts of the country

3. Westminster Palace-
the meeting place of the House of Commons and the House of Lords, the two houses of the Parliament of the United Kingdom.

4. Trafalgar Square-
a square in Central London, built around the area formerly known as Charing Cross.

5. Royal Albert Hall-
the most prestigious concert hall of Great Britain.

6. Buckingham Palace-
the official London residence and principal workplace of the British monarch.

7. Nelson's Column-
a monument in Trafalgar Square in central London built to commemorate Admiral Horatio Nelson, who died at the Battle of Trafalgar in 1805.

8. Double-decker Bus-
Red double-decker buses are used for mass transit in London.

9. Westminster Abbey-
a large, mainly Gothic, church, which is one of the most notable religious buildings in the United Kingdom and is the traditional place of coronation and burial site for English and, later, British monarchs.

10. Albert Memorial-
It was commissioned by Queen Victoria in memory of her beloved husband, Prince Albert who died in 1861.

11. White Tower-
a central tower, the old keep, at the Tower of London.

12. National Gallery-
an art museum on Trafalgar Square in London.

13. Telephone booth-
a small structure furnished with a payphone and designed for a telephone user's convenience.

14. Elizabeth II-
Queen of the United Kingdom and of the other Commonwealth realms since 2 June 1953.

15. London Eye-
a giant Ferris wheel on the South Bank of the River Thames in London.

16. Big Ben-
the biggest of the six bells of the Palace of Westminster in London, often this name is attributed to the watch and clock tower in general, which since September 2012 is officially called the «tower of Elizabeth»

17. St Paul's Cathedral-
a Church of England cathedral, the seat of the Bishop of London and mother church of the Diocese of London.

18. Tower Bridge-
a bridge in London which crosses the River Thames.

19. The London Underground-
a public rapid transit system serving a large part of Greater London and parts of the counties of Buckinghamshire, Hertfordshire and Essex.

20. And other open Internet sources
Thanks to
Wikipedia
And other open Internet sources