Despite being the fifth most populous city in the country, Philadelphia is an overlooked urban treasure, tucked between the Big Apple and the Washington DC. Rejuvenated over the last few years, ‘the city of brotherly love’ is steadily emerging as a travel destination. It’s got great restaurants and museums, and a major dose of history as the first capital of the U.S. And, of course, don’t forget to try the cheese-steak.