It's a well known fact that the Queen is "at home" when the Royal Standard flies above Buckingham Palace where she does spend a significant portion of time, but the Royal family have many London locations that they frequent and Windsor Castle is said to be one of the Queen's favourite places to pass the weekend, with her beloved corgis of course!
Amazingly, both Buckingham Palace and Windsor Castle are open to visitors nonetheless. You can peruse the gilt-walled, fresco-ceilinged state rooms at both at your leisure if you book in advance, as well as witnessing the famed Changing of the Guard. A particularly lovely feature of Windsor Castle is St George's Chapel, where Prince Harry and Meghan Markle were married, and if you're feeling energetic the grounds are extensive!
Not to be outdone however, are other Royal London residences such as Hampton Court Palace and Kensington Palace. Hampton Court Palace is perhaps most famous for one of its notoriously merciless former inhabitants, King Henry VIII and while there is historical gore galore to be had within the palace's museum walls, a somewhat more pleasant display is currently on offer in the grounds outside whose gardens are an absolute delight.
And finally, the home of the young royals the Duke and Duchess of Cambridge and family, Kensington Palace is really a destination not to miss. There is a lot on this summer, with the newly restored Orangery housing a display of Princess Diana's wedding dress and the palace's beautiful gardens hosting an exhibition on Van Gogh, as well as guided tours of the Albert Memorial and the park's ancient trees.