Philadelphia is where the United States wrote itself down. The Pennsylvania State House, finished in 1753 and now called Independence Hall, saw the Declaration of Independence adopted on July 4, 1776, and the Constitution drafted there in the summer of 1787. William Penn and his surveyor Thomas Holme planned the city as a grid around five squares, and the grid is still how you find your way. The sights of 1776 sit a few minutes' walk from each other, which is why the historic district feels more like a campus than a museum.
The city doesn't try to be New York or Washington. It is brick row houses, murals on blank walls, a market hall from 1893 and sandwiches that start arguments. Three days is the right length: the historic district fills one day, the Parkway museums a second, and the third belongs to a prison, the murals and South Philadelphia. A fourth day buys you Valley Forge or a garden, not more of the same.
Day one is Old City, day two Center City and the Parkway, day three Fairmount and South Philly. Start on a Thursday: the Barnes and the Art Museum are closed Tuesdays and Wednesdays, the Art Museum stays open until 8:45pm on Fridays with pay-what-you-wish admission after 5, and John's Roast Pork, open Tuesday to Saturday only, lands on a Saturday with the Italian Market at its busiest. The clocks go back on the first Sunday of November (November 1 in 2026), so from then on sunset comes between 4:35 and 5pm and the plan keeps indoor stops for the dark hours. The 250th anniversary of the Declaration falls in 2026, with a dated note in the tips. For the country as a whole, see the United States guide.