ArchEX
   Guided tours and study trips by architects in the Netherlands and in Germany. From architectural city walks to complete arrangements for several days [English/Dutch/German]
   http://www.archex.info/

Archetours
   Specializes in architectural study tours of Europe. Themes range from contemporary art and architecture to classical ruins.
   http://www.archetours.com/

Architectour
   Specialized tours featuring the history of Rome as seen through its architectural and cultural heritage. Tour highlights, accommodation details, and booking request.
   http://www.architectour.com

Architectural Dialogue
   Information about contemporary and historical architecture tours around London.
   http://www.architecturaldialogue.co.uk/

Architour
   Tours in the Netherlands with Anneke Bokern, covering contemporary and classical modern architecture and urbanism. Ranging from half days to several days, on foot, by bike or bus. [English/German]
   http://www.architour.nl/

Art and Architectural Tours
   Florida-based provider of guided art and architectural educational tours in Europe and seminars. Details of tours, photographs, registration form.
   http://www.art-architecttours.com/

Cultevero
   Company offering specially made guided tours and lectures in English and Swedish of Swedish cultural heritage, covering architecture, art and history. Focus on Stockholm.
   http://www.cultevero.com/

Doctor Thomson's Tours
   Personally guided city tours, day trips to France and Belgium. Various tours in medieval Canterbury, England. World War I and II battlefields.
   http://www.drttours.co.uk/

John Hall Pre-University Course
   Designed for gap year students, offering an introduction to Italian and European civilisation in London, Venice, Florence, and Rome. Art, architecture, sculpture, music, cinema, photography, painting.
   http://www.johnhallpre-university.com

Restoration Travel
   Trips for travelers who want to help preserve historic landmarks and world heritage sites while they explore and enjoy new places. Destinations, packages, reservations.
   http://www.restorationtravel.com

Romenchantress
   An architect and a philologist team up to offers special tours into ancient and modern Rome and southern Italy. Itineraries with photographs.
   http://www.romenchantress.com

Syam Kuk
   Khmer art and architecture in South East Asia. Itinerary and expedition information. (Multilingual)
   http://syamkuk.tripod.com/

The Landmark Trust
   A charity which rescues buildings of historic or architectural importance, and makes them available as tourist accommodations.
   http://www.landmarktrust.co.uk/

UK Cathedrals
   Tour excursions highlight small group tours into cathedrals and castles of the United Kingdom.
   http://www.ukcathedrals.com/