What is One Piece?

[Deblas]

I'm pretty sure in an interview with Oda he said One Piece was a tangible object.

you remember what interview?...I don't remember anything about that.

It would be awesome if it is in fact a shit load of gold but most likely it will be something symbolic. I'm just gonna put what I wrote somewhere else (can't remember where).

Gold Roger said he left EVERYTHING he owned in One Piece. What did he own? Wealth, fame, and power. I believe Raftel (the last island) doesn't hold Gold Rogers treasure, instead it holds a deep meaning. The Grand Line is a very dangerous place and Raftel is the last and hardest island to reach. Pirates who are able to reach it are pirates with great wealth, great fame and great power and that is what I think One Piece really is. You will have gained all those three aspects when you finally reach the last island. Raftel just gives proof that you are indeed the greatest pirate that ever lived.

meh...its just a thought. It could just be a mountain of gold....or the rio poneglyph.