A Taste of the World
Walking and cycling tours of Toronto's neighbourhoods for foodies, literary types and ghost hunters.
http://www.torontowalksbikes.com/

A Tour de Force
"A connoisseur's tour of Washington, DC.".
http://www.atourdeforce.com/

Absolute Walking Tours
"Experience the real Budapest".
http://www.absolutetours.com/

Berlin Walks
Specializes in walking tours of the German capital, conducted in English.
http://www.berlinwalks.com/

Big Onion Walking Tours
Explore New York's ethnic neighborhoods and historic districts.
http://www.bigonion.com/

Boston by Foot
Explore Boston's rich heritage of architecture and history in the company of dedicated and enthusiastic guides.
http://www.bostonbyfoot.com/

Centipede Incorporated
Stroll through colonial Philadelphia with a tour guide.
http://www.centipedeinc.com/

Chicago Architecture Foundation
Marvel at the city's skyscrapers from street level.
http://www.architecture.org/

City Sightseeing
City Sightseeing operate walking tours of Stockholm.
http://www.citysightseeing.com/

Cityside Walks
Walking tours of London. No need to book in advance.
http://www.citysidewalks.co.uk/

Context Rome
Context Rome designs and leads walking seminars for visitors to Rome.
http://www.contextrome.com/

Copenhagen Walking Tours
Discover one of Europe's most walkable cities in the company of a professional guide.
http://www.copenhagen-walkingtours.dk/

Discover the Mystery of Hassidic Life
Walking and bus tours of Jewish New York.
http://www.jewishtours.com/

Edinburgh Literary Pub Tour
Explore the life and work of Scotland's great poets and novelists from the early 18th century to the present day.
http://www.edinburghliterarypubtour.co.uk/

Geogad
Turn your Mp3 player into a personal mobile tour guide, complete with voice narration and pictures. The tours, which are free to download, are tailored to your interests and are conducted at a pace and schedule that suits you.
http://www.geogad.com/

Guidatour
Professional tours of Quebec's major cities, including a walking tours of Montreal.
http://www.guidatour.qc.ca/

Heritage Montreal
Walking tours of Montreal's historic architecture conducted in English and French.
http://www.heritagemontreal.qc.ca/

Historical Walking Tours of Dublin
The title says it all.
http://www.historicalinsights.ie/

iJourneys
A commercial website that allows customers to download Mp3 audio tours to major tourist centres in France and Italy.
http://www.ijourneys.com/

Le Bus Bavard
Walking tours of Brussels in the company of knowledgeable guides.
http://www.busbavard.be/

London Audio Tours
MP3 audio tours that allow you to discover the city at your own pace.
http://www.londonaudiotours.com/

London Walks
Download London walking audio guides to your MP3 player.
http://londonwalks.libsyn.com/

Los Angeles Conservancy
Walking tours of Los Angeles' historic districts.
http://www.laconservancy.org/

Mercat Tours
Ghost and history tours of Edinburgh.
http://www.mercattours.com/

Mercurio Tours
Offers walking tours of Florence.
http://www.mercurio-italy.org/

Michelle Nevius
Get the best out of the Big Apple with a private walking tour.
http://www.walknyc.com/

Munich Walk Tours
The lineup includes a city tour, tours of Hitler's Munich and Dachau, as well as tours of Munich's beer halls and breweries.
http://www.munichwalktours.de/

My Favourite Things
My Favourite Things organizes original walking tours in Barcelona.
http://www.myft.net/

New York City Cultural Walking Tours
Private and public tours of the city.
http://www.nycwalk.com/

Paris a Pied
Get to know Paris through one of Paris a Pied's walking tours.
http://www.parisapied.com/

Paris Walkabout
Private walking tours of Paris.
http://www.pariswalkabout.com/

Paris Walks
Daily walking tours in English, led by a small team of professional guides with many years' experience in Paris.
http://ourworld.compuserve.com/homepages/pariswalking/
http://www.paris-walks.com/

Paul Rush Walks.com
Private historical and architectural walking tours of New York with a licensed guide.
http://www.paulrushwalks.com/

Peter's Walking Tours
Guided tours of Saint Petersburg, Russia, for English speaking tourists.
http://www.peterswalk.com/

Photo Walks
Historic walking tours of Boston with a photographic edge.
http://www.photowalks.com/

Photo Walks of London
Take in London's sights while learning to use your camera proficiently.
http://www.photowalksoflondon.com/
http://www.photowalkslondon.blogspot.com/

Prague Walks
Discover Prague on foot.
http://www.praguewalks.com/

Radical Walking Tours
Historical walking tours of New York City.
http://www.he.net/~radtours/

Red Line Tours
Hollywood sightseeing tours.
http://www.redlinetours.com/

Rio Tour Guide.com
Walking tours of Rio, as well as night tours.
http://www.riotourguide.com/

Rome Insight
Private walking tours of the Eternal City.
http://www.romeinsight.com/

Rome Walks
Walking tours of Rome conducted by an English language cultural association.
http://www.romewalks.com/

Royal Ontario Museum
Guided walking tours of historic Toronto.
http://www.rom.on.ca/explore/publicprograms/romwalks.php

Secret London Walks & Visits
An original way to discover the hidden and secret parts of this famous city.
http://www.secretlondonwalks.co.uk/

Shopping Secrets
Small group walking tours uncover Melbourne's creative retailers.
http://www.shoppingsecrets.com/

Soundwalk
Interactive audio tours to a growing list of tourist destinations.
http://www.soundwalk.com/

Stattreisen Hamburg
Thematic city walks of Hamburg.
http://www.stattreisen-hamburg.de/

Street Smarts N.Y.
Operates a variety of weekend walking tours in Manhattan and Brooklyn.
http://www.streetsmartsny.com/

Talks & Walks
Offers a range of New York tours from child-friendly rambles to twilight walks.
http://www.newyorktalksandwalks.com/

The Original London Walks
Guided tours of London Town.
http://www.walks.com/
http://london.walks.com/

The Rocks Walking Tours
Historic Sydney walking tours.
http://www.rockswalkingtours.com.au/

The Wellington Society of Madrid
Historic tours of Madrid, Spain, Portugal, England and Waterloo in the company of historian and writer Stephen Drake-Jones.
http://www.wellsoc.org/

Tour Black Chicago
Choose between self-guided and organized tours of one of the country's largest African American communities.
http://www.tourblackchicago.com/

Tour DC
Walking tours of Georgetown in Washington DC.
http://www.tourdc.com/

Tour London
Tour London on foot.
http://www.tourlondon.com/

Tourist Tracks
Download an MP3 file or buy a CD containing an audio walking tour to any one of a number of popular UK tourist destinations.
http://www.tourist-tracks.com/

Vienna Walks
"Jewish Vienna" and "The Third Man" are just a couple of the themed tours run by this company.
http://www.viennawalks.com/

Walk 'n' Talk
Half-day tours of Melbourne.
http://www.walkntalktours.com.au/

Walkabout Historic Vancouver
Discover Vancouver's heritage.
http://www.walkabouthistoricvancouver.com/

Walks Inside Venice
Private educational and customized tours with professional guides.
http://www.walksinsidevenice.com/

Washington D.C. Sightseeing
Anecdotal history tours of Washington DC.
http://www.dcsightseeing.com/

Welcome to Moscow
Provides escorted tours of the Russian capital.
http://www.welcome-moscow.com/

Wok Wiz
Culinary and historical walking tours of San Francisco.
http://www.wokwiz.com/