The 20 km long Hadrian's Wall in England in Northumberland National Park is a favourite for walkers. (Toronto Sun)

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London isn't one of the world's bargain destinations but it's possible to have a day out for less than a "tenner" -- a 10-pound note (almost $24 Cdn).

Start with the free attractions: The British Museum, the National Gallery and National Portrait Gallery in Trafalgar Square, the vast and fascinating Tate Modern gallery across the Thames from St. Paul's Cathedral, the Imperial War Museum, the Victoria and Albert Museum, the Natural History Museum and the Science Museum -- just to name the best-known among the capital's 200 or so museums and galleries.

Most museums will also have special exhibitions that do charge admission.

There's no charge for watching the Changing of the Guard at Buckingham Palace, which happens daily at 11:30 a.m. from April through the end of July, and every other day the rest of the year. Check the Buckingham Palace section of the royal website, www.royal.gov.uk, for details.

Admission is also free for the Ceremony of the Keys at the Tower of London at 9:50 p.m. each night, but you need to plan ahead. (Visitors may request up to seven passes by writing to: The Ceremony of the Keys, H.M. Tower of London, London EC3N 4AB.)

A cheap but vanishing essential of any London visit is a ride on one of the double-decker Routemaster buses; they're the ones with the open platform on the back and a conductor waiting to sell a ticket.

The fare is just 1.20 pounds for a single ride; you can also get an all-day London Transport ticket, which includes Underground trains too, for 4.70 pounds.

If you fancy shopping, London boasts a variety of markets selling everything from fresh fish to vintage jewelry. Take a trip on the Central line tube to Liverpool Street for a day at Petticoat Lane market, and trawl through the vintage clothing.

Pretend you are Eliza Doolittle and roam through the old and new in the Covent Garden market, and catch some of the street performers.

People cross the Millennium Bridge in London over the river Thames. (AP Photo/Sang Tan)

Many say the best way to view London is by foot. Walking tours are a popular way of catching the hidden details, and the guides have a wealth of knowledge.

Scare yourself on a Jack the Ripper walk or relive Shakespeare's London. Original London Walks -- www.walks.com -- offers 100 routes at five pounds each.

For the same price, London Mystery Walks -- www.tourguides.org.uk -- offers the Jack the Ripper walk and the Haunted London walk.

The National Theatre on the Southbank -- www.nt-online.org -- offers the Travelex 10-pound season, when two-thirds of the seats are available for a tenner.

Websites such as www.lastminute.com may have some theatre tickets for the same price.

Chris Davis, 8, left, and Steve Mitchell, 9, jump into the fountain on the Victoria Monument outside Buckingham Palace in London. (AP Photo/Max Nash)

The Tricycle Theatre, one of London's better-known small theatres, offers 30 to 50 tickets to Tuesday and Saturday matinees on a "pay what you can" basis. This offer is available to students, seniors and people with disabilities. The theatre also offers some "early bird" tickets for less than 10 pounds.

Rail lines serving London offer a range of "two for one" deals.

Attractions taking in part in the promotion include the Royal Botanic Gardens at Kew, HMS Belfast, Dali Universe, Tower Bridge Exhibition and The London Aquarium. Details at www.london2for1.com; typically you have to produce a train ticket and a voucher from the website to qualify.

If You Go...

Free attractions in London: The British Museum, the National Gallery, National Portrait Gallery, Tate Modern, Imperial War Museum, Victoria and Albert Museum, Natural History Museum and Science Museum. The Changing of the Guard at Buckhingam Palace is free to watch; check www.royal.gov.uk for schedule.

Walking tours: Tickets are five pounds; go to www.walks.com or www.tourguides.org.uk for details.

Theatre tickets: Some tickets are available for a tenner or less; check www.nt-online.org, www.lastminute.com or www.tricycle.co.uk/

Two-for-one: Some rail lines offer two-for-one tickets to the Royal Botanic Gardens at Kew, HMS Belfast, Dali Universe, Tower Bridge Exhibition, The London Aquarium; details at www.london2for1.com.

For more information: www.visitlondon.com, www.mysouthbank.co.uk or (800) 462-2748.