Ownership and Archeology

The Peruvians want their machu picchu artifacts back. The Egyptians want their own stuff back too. In the meantime, powerful 'western' entities (like the british museum and Yale) refuse to return that stuff. Their most crucial arguments?

A: They might still be undiscovered if it weren't for the money they spent and the archeologists they sent. The artifacts' value was provided, in large part, by their discovery.
B: The artifacts are more accessible in their current location than they would be in their home countries. Fewer people are likely to travel to Egypt and Peru just to look at some old stuff, where-as people go to london and the american north-east way more often.

I'm not yet sure where I stand on this problem though I'm definitely leaning toward returning the items along with hefty donations (a sort of back payment) to make sure that they will be well maintained for years to come, regardless of whether people go see them or not.

The benefits - like, that more tourism will lead to more prosperity in countries that need it more than we do - seem to outweigh the drawbacks.

Maybe we can compromise. Let's put all the world's ancient artifacts in Antarctica.