Museum of Antique Automobiles

None other than Prince Rainier III funded and gifted this museum with his personal collection of cars; if you go gaga for autos you'll absolutely freak out over the array on display here.  There are 100 vehicles, which range from carriages (as in horse-drawn ones) to the Rolls Royce that Grace Kelly rode in on her wedding. One TripAdvisor user says, "I would recommend this museum to any car enthusiast, or, for that matter, even non enthusiasts, as it is most impressive, as is the whole principality."

Admission is €6 EUR (or about $8 USD), and you can visit the Museum of Antique Automobiles every day from 10 a.m. to 6 p.m.