To promote its travel service, railway company SNCF teamed up with ad agency TBWA Paris to create an ad campaign that sends pedestrians to other European cities—simply by opening a door. 

The campaign, called ‘Europe, It’s Just Next Door’, features brightly colored doors with the names of cities plastered on them. These doors were then placed in public areas around Paris. 

When opened, the doors displayed real-time events happening in those cities. For example, pedestrians could watch a mime performance in Milan, have their portraits drawn by a sketch artist in Brussels, or join a hip-hop dance crew in Barcelona.