Djinguereber Mosque, Timbuktu.
I'm sure a number of people in the English speaking world have heard a phrase or two when describing a long and rigorous journey, ie: from here to Timbuktu and so forth. Here's a little bit of history about the usage of Timbuktu as a metaphor.
But before anything else, yes Timbuktu is a real place, and yes you can get a postcard from there too! So how did I get mine? I had stumbled upon this project called "Postcards from Timbuktu." What I liked about it was the fact that (hopefully,) this was providing work for some of the locals and contributes to their economy somewhat.
About this card, this shows one of the three great mosques in Timbuktu. The town itself is listed as a UNESCO world heritage site.
The back of this cool card, it was hard to see but it looks like the card was postmarked Sept 19th. Not bad for a month considering how it travels around Mali, then to France, and presumably to Canada next.
I also went to the trouble to convert the cost of postage, surprisingly sending a postcard in Mali is the same as sending one in Canada. Definitely not a cheap hobby at all there either!