London will happily take £37 for a castle and £20 for a sandwich and a coffee. But the city's greatest treasures cost nothing: the national museums, the parks, the river, the pageantry and some of the best views in Europe. Here is how to fill a week without buying a single attraction ticket, with the catches the free-list websites forget to mention.
Britain's national museums have been free to enter since 2001, and London has the best of them. Many ask for a donation at the door; it is optional.
Two million years of human history, and the most argued-over collection on earth, including the Benin Bronzes and the Parthenon sculptures. Read our honest guide first.
On Trafalgar Square: Van Gogh, Turner, Leonardo, and the faces of British history next door.
Modern art in a former power station on the South Bank, and five centuries of British art at Millbank. Take the Tate Boat between them.
Three giants side by side in South Kensington: dinosaurs, rockets, fashion and design.
The wars and the navy that made and defended the empire, in Lambeth and Greenwich.
Its "London, Sugar & Slavery" gallery shows how the city's docks grew on the slave trade.
Before you go, read Benin Bronzes, Asante gold and African treasures in British museums to know what you are looking at, and how it got there.
London's eight Royal Parks, from Hyde Park and Kensington Gardens to Regent's Park, St James's Park, Greenwich and Richmond with its wild deer, are free and open all year. Walk the South Bank from Westminster Bridge past the London Eye, the Tate Modern and Shakespeare's Globe to Tower Bridge: one of the best free walks in any city.
Free to wander, though you will want to spend: Borough Market for food, Camden for street food and alternative fashion, Portobello Road for antiques on a Saturday, Columbia Road for flowers on a Sunday, and Brixton for African and Caribbean food and music. Read about Brixton in our page on Brixton, Windrush Square and the Black Cultural Archives.
When you are ready to spend: entrance fees are included in the tour price; tips are not included but are always welcome.
Where to stay, what to see and the city's hidden history.
Worth the £37? What you see, and what the Crown Jewels have to do with Africa.
Fares, caps, money and the unwritten rules.
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