Panama, if you are of retirement age. The Panamanian government gives gringos a free passport to stay there if you'll show proof of a regular pension check (or social security check). There is no age requirement, just $650 a month for you and your wife.
Hong Kong, if you have a million US dollars, they will give you a free passport. You just need to deposit your money in a Hong Kong bank.
Similar offers abound in countries such as Belize, Costa Rica, Honduras, Venezuela, Thailand and Canada. If you get citizenship in Venezuela, you could use that as a stepping stone to gain citizenship in Spain. This will let you travel/live anywhere in the EU.
