The National Gallery

The National Gallery is the most relevant art museum in London and one of the most famous worldwide. It has an impressive collection of paintings covering the period between 1260 and 1900, with works from virtually all renowned artists of the era. The museum's main entrance is at the Sainsbury wing, to the left of the main building, where you'll find the oldest paintings such as works by Giotto and Jan van Eyck.

Late Renaissance works from Titian, Michelangelo and others can also be found in the west wing. Seventeenth-century paintings from Italy, Flanders, Spain and the Netherlands are displayed in the north wing and features works from masters such as Rubens, Van Dyck, Rembrandt and Caravaggio. Paintings from the eighteenth and nineteenth centuries are on display in the east wing. Here you'll find impressionist and post-impressionist works from artists like van Gogh, Seurat and Renoir. 

FYI: admission is free.