Downton Abbey was filmed in London in the United Kingdom.
Locations
Halton House
Real
In movie
West Wittering Beach
Real
In movie
Lancaster House
Scene was shot Lancaster House is a neo-classical mansion constructed in 1825 for the Duke of York and Albany designed partially by Sir Robert Smirke before he was replaced by Benjamin Dean Wyatt. The interior wasn't completed until 1840 with the help of a third architect Sir Charles Barry. The house has become a popular stand-in for Buckingham Palace in films and TV playing that role half a dozen times.