United Kingdom - Westminster Palace, Westminster Abbey and Saint Margaret's Church

"Westminster Palace, rebuilt from the year 1840 on the site of important medieval remains, is a fine example of neo-Gothic architecture. The site – which also comprises the small medieval Church of Saint Margaret, built in Perpendicular Gothic style, and Westminster Abbey, where all the sovereigns since the 11th century have been crowned – is of great historic and symbolic significance." 

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 Abbey

Westminter Abbey, London. Thanks to Zawadzki of UK.

Postcard 3 - The Houses of Parliament

Thanks to Haldane of London.