If you have done all the Istanbul sightseeing and still have some spare days in your agenda then you should consider taking one of the day trips from Istanbul to Edirne and pay a visit to the impressive Edirne Mosque called Selimiye. Nowadays a sleepy little town full of history, but once the capital of the Ottoman Empire, Edirne, Turkey lies only a few kilometers from the Bulgarian and the Greek border. I admit it was pretty tempting to make a little detour and cross into these two countries, as I had never been to any of them. But as we were toured around by the Turkish Tourism Board it would have been a little inappropriate to leave the country. ;) Surely some day I will end up there again!