For today's Geo Quiz keep this formula in mind: One dollar equals 39 rupees. The place we have in mind is in India. It's a 17th-century fortress and mausoleum located in the city of Agra.

It's also one of India's top tourist attractions and a UNESCO "world heritage site." Well over 2 million Indians and 800,000 foreign tourists visited it last year.

Americans traveling to India might be warned to expect crowds and traffic on their way to major tourist attractions.

Here's another tip for US tourists headed for the famous landmark in Agra.
Get yourself some rupees!

Ticket sellers there no longer accept dollars.

So -- if you want a tour of the architectural treasure built by Mughal Emperor Shah Jahan -- put away the bucks back in your wallet and dig out 250 rupees.

We'll name the monument itself -- for free...