BUT THE ELGIN MARBLES. YOU GUYS. THE ELGIN MARBLES.
Quick recap: in 1816 or thereabouts, Lord Elgin of Britain got the then-rulers of Greece, the Ottoman Empire, to let him chisel a bunch of marble slabs off the Acropolis in Athens. He also snagged some sculptures and stuff, all ancient, gorgeous marble work. All from the Parthenon. Important: Though they are called the marbles, they are not marbles that you keep in a bag but instead big works of art made of marble.
Now Greece wants them back. Really, really bad. This is a nationalist thing, and having your greatest art treasures stolen by colonial invaders can't be great.
So, in today's installment of IMPRESS YOUR FRIENDS WITH KNOWLEDGE OF ESOTERIC CRAP, here's a summary.
GREECE: Give us back our damn marbles.
BRITAIN: Oh you mean the Elgin marbles?
GREECE: We call them the Parthenon marbles.
BRITAIN: Well, good then, but they're in our lovely British Museum and they're quite happy there. Millions of tourists. Come visit if you like, but wipe your feet.
GREECE: THOSE ARE OUR MARBLES, YOU THIEVING SONS-OF-RATS.
BRITAIN: It's not as if you have a decent museum to put them in anyway. They'll just sit by in some potty old shed and no-one will ever look at them.
GREECE: Well, you ... hmm. Hold on.
GREECE: OK, how do you like THIS museum?!
BRITAIN: Hm. It's pretty nice actually. I like the glass bits.
GREECE: GIVE US BACK OUR DAMN MARBLES.
BRITAIN: Nope. Can't.
GREECE: I hate you.
BRITAIN: If we give you these, you'll want all the others and then the only thing we will have is that stupid Banksy that he put in here for a joke.
GREECE: I am going to hold my breath until I die unless you give me the marbles.
BRITAIN: But, really, it's just going from one museum to another, so what's the difference?
GREECE: Hey, Egypt, let's go steal Westminster Abbey and see how they like it.
There was an actual demonstration in Athens. A PROTEST. With SIGNS. All about how THEY WANT THEIR ART BACK.
I think that's pretty great.
I don't know what they should do about the marbles, but 1) The British Museum didn't give back works they got that were looted by Nazis, so they won't be swayed by emotional appeal, and 2) The Greeks are being very pointed with their museum -- they use the marbles they have left and fill in the rest with these stark white plaster castings of the real things, with the color distinction yelling "LOOK WHAT SHOULD BE HERE! BOMB BIG BEN."