Etiquette (such as greetings) varies according to the country you visit; if in doubt, ask locally for advice.
- Dress modestly to enter religious sites such as churches.
- Avoid visiting religious sites at key times (such as services) if you're sightseeing only.
- Always ask permission before taking photos of people or their property (such as merchandise in shops).
- Switch mobile phones to silent in restaurants and entertainment venues; take calls outside.
- 'Love locks' (padlocks attached by couples as a symbol of their union) are a blight on many public structures across Western Europe and cause structural damage – avoid adding to the problem.
- Learning at least a few words of the local language (hello, please, thank you, goodbye) is not only respectful but will make your visit infinitely more rewarding.