The Prince of Wales Museum

…aka the Chhatrapati Shivaji Maharaj Vastu Sangrahalaya… now just think what you'd call it :D - Its across the road from the Regal theatre at Colaba. Nice museum, imposing façade (though you'll often miss it because of the trees), a wide collection (in fact, I'd consider this second only to hyderabad's Salarjung museum). The collection from Indus valley times and the porcelain from China is pretty good. Its also got a new section with some of the best lighting and wood paneling I've ever seen in a museum. I only wish they had more places where you could sit down and rest and that there were cheaper guides around the place. Overall, a good place to visit if you (like me) have nothing better to do on a Sunday and have an FM radio or a walkman at hand.