Wellington Arch
A neoclassical triumphal arch, designed by Decimus Burton and first erected in 1826 as a grand entrance to Buckingham Palace. In 1846, a massive equestrian statue of the Duke of Wellington was placed on top of the arch. a major road widening of Piccadilly in 1882 was the opportun

A neoclassical triumphal arch, designed by Decimus Burton and first erected in 1826 as a grand entrance to Buckingham Palace. In 1846, a massive equestrian statue of the Duke of Wellington was placed on top of the arch. a major road widening of Piccadilly in 1882 was the opportun
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