World's oldest restaurant - Casa Botin in Madrid, Spain

Those authoritarian chaps at Guinness World Records have attempted to silence the bickering over who gets the honour of being dubbed the world’s oldest restaurant, and have declared the Casa Botin in Madrid, Spain the winner.
Tucked away on Calle de Cuchilleros near the main square in the Spanish capital, this has become something of a tourist trap, but it has been open since 1725 for a very good reason.
Whilst most diners are visitors, it is not one of those places that the locals conspicuously avoid because the food isn’t up to scratch.
Quite the contrary, in fact, with the house speciality of roast suckling pig reputed to border on the divine and well worth the few extra Euros you’ll pay for location and gimmick factor.

More information: Casa Botin