What it is, what to see and when to go.
Westminster is where Britain is governed and where its monarchs are crowned. Within a ten-minute walk you pass the Palace of Westminster, the Elizabeth Tower that holds Big Ben, Westminster Abbey and the government offices of Whitehall. Most of the district is a single loop around Parliament Square, so you can see the outside of every major sight in an hour and spend the rest of the day inside one or two.
Westminster Abbey has hosted every coronation since 1066 and holds the tombs of Elizabeth I, Isaac Newton and Charles Darwin. Across the road, Parliament runs guided tours on Saturdays and on most weekdays during recess; book ahead and allow time for airport-style security. Opposite the Abbey stands the Jewel Tower, a 14th-century survivor of the medieval palace, built to hold Edward III's treasure and now run by English Heritage.
Walk up Whitehall for the twentieth century. The Churchill War Rooms are the bunker where the War Cabinet met during the Blitz, left much as it was in 1945; timed tickets sell out in summer. Further on are Lutyens' Cenotaph and the gates of 10 Downing Street, which you can view but not enter. The Winston Churchill statue faces Parliament from the green of Parliament Square.
When to go: weekday mornings, before the coach groups arrive. The Abbey is closed to sightseers on Sundays, though anyone may attend a service, and Parliament tours mostly run on Saturdays, so plan the two around each other. For the classic Big Ben photograph, cross Westminster Bridge or stand on the South Bank. Stations: Westminster (Jubilee, District and Circle lines), St James's Park (District and Circle), Embankment and Charing Cross.
Ten centuries of royal and political history in one square mile.

Walk the same stone floors where 40 monarchs were crowned and trace royal tombs and poets' memorials under soaring Gothic vaults. Step inside for…
2Stand beneath Elizabeth Tower, where Big Ben rings out over the Thames, and feel the weight of centuries of lawmaking in the Gothic stone around…
3Descend into the underground rooms where Britain's wartime government made its decisions, then follow Winston Churchill's life through the museum…
4Tilt your head back beneath the clock tower at Westminster and wait for the Great Bell to strike. Its chimes roll out over the Palace of…
5Stand before Lutyens's bare stone tomb on Whitehall, where the empty space speaks for the dead buried far from home. Join the crowds who come to…
6Stand in Parliament Square and look up at Churchill, with the Houses of Parliament and the towers of Westminster Abbey around you. Pause here…
7Built in 1365 to guard Edward III's treasure, this stone tower is a rare survivor of the medieval Palace of Westminster. Step inside for its…
8Stroll down a narrow street off Whitehall and find the famous black front door of Number 10, where Britain's prime minister works. Snap your…
Central and quiet at night once the offices empty, with prices to match. See hotels on a map with live prices.
Museums, landmarks and hidden gems on one map, plus 17 day trips.