Hi, recently we came into some old currency left by a family member. I've tried looking every where and it seems I can't find nothing. Does any one know a site I can go to online where I can maybe enter the serial number of the currency?

RCSB Currency Collection (http://www.ronscurrency.com/rcol.htm#MTOP)
Old Coin and Currency Values (http://www.jakesmp.net/JGI/jgi_Coin_values_C.html)

Most numismatists collect coins but some paper currency can be worth a lot. It all depends upon the scarcity.