Visa waivers allow passport holders to stay beyond 90 days. But Border Officials are unaware or unwilling to recognize them.
How to extend a visa in Spain.
A list of countries in the Schengen zone that have Bilateral visa waiver treaties, and some useful backstory information.
Visa waiver agreements allow Australian passport holders to stay in certain Schengen countries without impacting the 90 day Schengen visa waiver.
How I used the Italian bilateral arrangement to stay another 3 months in Italy.
My experience applying for a long-stay visa in France.