The City of London, the historic core of the capital, boasts a remarkable collection of ancient and landmark structures. The Tower of London, founded in 1078 by William the Conqueror, has served as palace, prison, and treasury, now housing the Crown Jewels. St Paul's Cathedral, Christopher Wren's Baroque masterpiece completed in 1710, dominates the skyline with its iconic dome. Westminster Abbey, a Gothic UNESCO site founded in the 10th century, is the coronation church of British monarchs.
Other notable sites include The Monument (commemorating the 1666 Great Fire), Banqueting House (sole remnant of Whitehall Palace with Rubens ceilings), Old Royal Naval College (Greenwich UNESCO site), Leadenhall Market (14th-century covered market), Guildhall (medieval administrative center), the brutalist Barbican Centre (1982 arts complex), and the Royal Exchange (historic financial hub turned shopping destination). Together, they trace London's evolution from medieval fortress to global metropolis.