Europe’s largest free-standing marble staircase makes a suitably grand first impression on Christmas party guests at the Royal Horseguards Hotel. Exploring the chateau-style building’s myriad event spaces, it’s easy to see why Churchill spent quite so much of his downtime here. Another ex-PM gives his name to the standout Gladstone Library, which connects to the Reading & Writing Room, with its Thames views. Originally a billiards room, the Whitehall Suite offers high ceilings and more rivery vistas.
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