National Treasure, Book of Secrets was partly filmed at Lake Sylvan . Shots at the .12 mark, 1.21. mark and 1.37 mark. The treasure was allegedly under the Lake Sylvan rocks in the story line. I was on the rock where Cage opened up the vault(his hand in the rocks). 1:37 mark.

Because of the movie, a lot more people were there in 2010 when I was there verses 76-78 when I lived near there. BOO

2nd video, the first few seconds were filmed at Lake Sylvan.

https://www.youtube.com/watch?v=pDxiflW57r4



https://www.youtube.com/watch?v=Qeqmt804zbc