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If the question has any room for expansion to "architecurally significant" rather than strictly "Top 100", I'd offer this:Culver, age 13.
For me it was high school when two of us drove up to Banff and Jasper. Golf was secondary on the agenda as it was mostly supposed to be drinking beer and chasing Canadian girls. After the first round at Banff, I knew I had been missing something about the game. Couldn't put my finger on it until college, but I knew what I expected from a golf course had changed.