Schools for sailplanes
Belgium:
http://www.lvzc.be/index.php/clubs-in-vlaanderen
France:
http://ffvv.org/debutant-edito/annuaire-des-clubs
Germany:
http://www.segelflug.de/segelflug_de.html
(like i predicted ...a very long list)
Netherlands:
http://www.knvvl.nl/afdelingen/zweefvliegen/zweefvlieg-locaties-en-clubs/
United Kingdom:
https://www.gliding.co.uk/club-finder
USA: