Source: UNESCO World Heritage
Postcard 1 - St. Margaret's Church
St. Margaret's Church of Westminster Abbey, London. Thanks to Zawadzki of UK for helping me to complete the main sites of this UNESCO World Heritage in London.
Postcard 2 - Westminster AbbeyWestminter Abbey, London. Thanks to Zawadzki of UK.
Postcard 3 - The Houses of ParliamentThanks to Haldane of London.