The Lemon Tree

I had come home from work, stressed, I was about to relax and prepare a delicious aperitif, but I was missing lemon, the finishing touch to make it perfect. Tired of always missing something, I decided to go buy a lemon tree. I took the pointed shovel and began to make the well, I did not go beyond the third stroke when I heard a metallic noise. There was something buried! A very old, rusty metal box; inside it ... A paper with something written on it. I think it is an address to a Web page, but the truth is, I don't understand anything about technology, this is very intriguing, how is it possible that within something so old, that seems to be more than 100 years old, there is something like this. I need your help. You can help?