2013: A year in Google doodles

Search engine giant Google celebrates holidays, anniversaries, and the lives of famous artists, pioneers, and scientists by changing its logo with 'surprising, and sometimes spontaneous changes'.

Here The Drum takes a look back at some of 2013's best ones, including the 150th anniversary of the London Underground, St Patrick's Day, Thanksgiving and the 50th anniversary of Doctor Who.

9 January 2013: 150th anniversary of the London Underground

21 January 2013: Martin Luther King Day

14 February 2013: Valentine's Day

Google celebrated Valentine's Day and the creator of the Ferris Wheel, George Ferris' 154th birthday in one fell swoop with this interactive doodle.

25 April 2013: Ella Fitzgerald 96th birthday

8 May 2013: Saul Bass' 93rd birthday

30 June 2013: Herta Heuwer's 90th birthday

14 July: Ingmar Bergman's 95th birthday

27 September 2013: Google's 15th anniversary

Google celebrated its own birthday with a piñata doodle game.

23 November: 50th anniversary of Doctor Who

28 November 2013: Thanksgiving

2 December 2013: Carlos Merida's 122nd birthday

21 December 2013: 100th anniversary of the crossword

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