Tourists and madrileños alike nurse their Sunday hangovers at Mercado de San Miguel, a beautifully restored, glass-panelled indoor food market nestled behind the Plaza Mayor. It's open from 10am until midnight (later from Thursday to Saturday); perfect for early morning tapas and wine if you're still going from the night before, or a late coffee and breakfast if you slept the day away.
Although you can buy produce to take home, the main draws of the market are the tapas stalls and bars lining the outside edge: you can install yourself at one and spend the day nibbling and quaffing through their tapas and wine selections, or you can choose a little something different from each of them and settle in at the tables in the centre.
A few oysters, some squid croquettes and a chorizo paella later, I was just about feeling ready for another glass of wine...