Imperial War Museum
Fronted by two immense guns from Royal Navy battleships, the IWM focuses on British military history since 1914. The central atrium display of objects bearing "witness to war" (everything from a Harrier Jump Jet to a battle-scarred press Land Rover) branches into immersive and se

Fronted by two immense guns from Royal Navy battleships, the IWM focuses on British military history since 1914. The central atrium display of objects bearing "witness to war" (everything from a Harrier Jump Jet to a battle-scarred press Land Rover) branches into immersive and se
Check the official site before travelling; hours and prices can change.
More museums

Sir John Soane's Museum
Free, tiny, deranged — Soane's own house preserved exactly as he left it in 1837.

The Wallace Collection
Free national museum in a Manchester Square townhouse — armour, Boucher, the Laughing Cavalier.

The British Museum
Free, vast, civilisationally heavy — go for one room, not all of them.
Source: wikivoyage