Visit Denmark Website
The biggest tourism website in Denmark is power by Drupal!
The project has been developed by Propeople.
VisitDenmark is a multi site Drupal platform currently running more than 70 sites with high traffic and 300+ editors. The platform allows administrators to easily create new sites when needed with Drupal UI. The whole platform has been build on top of Drupal Domain Access module.
Some of the sites using the platform: