The Schengen Agreement led to the creation of Europe’s borderless Schengen Area in 1995.
The treaty was signed on 14 June 1985 near the town of Schengen in Luxembourg. It proposed the gradual elimination of border checks at the signatories’ common borders allowing residents in border areas to cross borders away from fixed checkpoints and the harmonisation of visa policies.
The Schengen Area operates very much like a single state for international travel purposes with external border controls for travellers entering and exiting the area, and common visas, but with no internal border controls.
It currently consists of 26 European countries covering a population of over 400 million people and an area of 4,312,099 square kilometres.