This week's Featured Web Site is suggested by Andy Lustig. MARAVEDIS.NET focuses on the money of Spain. It's in Spanish, but there is a link to get a machine-translated version in English.
At present there are more than 6000 types of currencies exhibited and described, in the different sections, from the gold currencies of the visigodos, those of the medieval of Castile and Leon, Aragon, and all the of Spain, as much the peninsular ones kingdoms, as those of the colonies and those of the Spanish European Empire.