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Ride metro line 2 to Darussafaka station and next to it on the circle corner of streets Buyukder and Ulu streets you can climb over the fance to Hacı Osman Korusupark(in my opinion the most easy climb is on the corner). Get only a bit inside but be carefull there ar some sharp plants

Look more at [http://nomadwiki.org/en/Istanbul Nomadwiki] for these info