Getting a Schengen Visa for travelling to any of the 29 Schengen Area Member States is the most difficult part of a trip to Europe, but even once the traveller gets the visa, not everything is over.
It is a rule that upon reaching any of the Schengen countries from a third country, travellers are asked at the passport controls a few questions regarding their trip. Sometimes, there are no questions at all, and sometimes, there are just too many questions that travellers are not always prepared to answer, SchengenNews reports.
Reference Link: https://schengen.news/5-