The Pudding Shop -- a tiny, open-fronted Istanbul patisserie -- was the first meeting point on the trail.  After 1967, everyone stopped here to eat sweet baked rice pudding and honey-soaked baklava topped with green pistachios. Outside its door English double-deckers parked by the Blue Mosque.  Pop music played in its garden.  On its wall was the legendary notice board where kids traded travel advice, found the address of the Iranian Embassy and checked out the safest route through Afghanistan.  'Gentle deviant, 21, seeks guitar playing chick ready to set out for mystical East,' read one message.  'Anyone know where to crash in Kabul?' asked another.  Here Paradise-bound freaks in Apache headbands and paisley waistcoats began their journey for India. 
You can read more about it with Rory Maclean 
The greatest journey of the Sixties and Seventies