Are you interested in archaeology (discovering old ruins, etc.)? It is a fascinating subject and hobby/career. Here is a story where they have just recently found some very old ancient ruins:
http://www.cnn.com/2008/TECH/03/15/peru ... index.html
I think it would be fascinating to go and dig, or search, for things like these. It doesn't have to be old ruins, it could be for old fossils (dinosaurs, etc.) or many things. It seems there is always something "old" to be discovered.
I'd be a little wary in some cases though wondering if there were perhaps a jinx or curse on anyone who might disturb some of these burial grounds, or sacred places, etc. Anyone remember "The Mummy" movies, lol.
