Mike The is no denying that The Big Mac Index is great for bringing to light the purchasing power of a dollar against other currencies.

War, interest rates, currency problems, an asteroid, who knows.

Now my parents are passed away, and I've managed to sell a piece of the land they left as inheritance and I have US$35,000 in brazilian currency.

Because I work for the company I cannot promote it publicly but if you're interested in an all-in-one property management and accounting solution that you can add bank accounts, categories and currencies while maintaining excellent records of your properties, leases, residents and all interactions, lets chat:)

Give it another 2 to 5 years and still no guarantees since with fiscal cliff we have looming issues with debt that is directly related to another issue the coming currency crisis.

In one, I make all the decisions, in the other, I have to hope China doesn't reposition their currency.

Try reading this book by John Bogle:Enough.You clearly have more than enough money to do a blend of passive index investing and summarily discard the notion that you need to spend any additional effort for the rest of you or your family's life on anything as banal as the pursuit of additional pieces of currency that add no real value to your life.  

Just a few options you have to invest in are: residential and commercial real estate, undeveloped or raw land, real estate notes (mortgages and deeds of trusts), private limited partnerships (limited liability companies and C corporations), tax lien certificates, foreign currencies, and oil and gas investments to name a few.

I personally own (in a top secret location) $500,000,000,000,000.00 in Zimbabwe currency.  

Information really is the new gold and an information backed dollar is what they call a "true" currency.