Philadelphia: a cracked bell, a giant's bones and a carved sun

Philadelphia is where American independence was declared, and everyone knows its bell and its hall. This quiz takes you through its history in 20 questions with pictures.

Why did the province bear a name its proprietor had not asked for, and what did he name his streets after? Who worshipped by the Delaware before the Quakers came, which steeple set a record in 1754, how did young Franklin's friends buy their books, and why did his fire brigade need linen bags?

Then the bell and the hall: what silenced the bell for good, who gave it its famous name, and where did the tale of a July 4 peal come from? What did Franklin decide about the sun on the convention chairman's seat, how did the first head of the new government get round Pennsylvania's law of 1780, why were the nurses of the Free African Society asked to face the fever of 1793, and whose bones filled a museum in the hall of independence?

Finally: who invented the flag scene, who gave an old lane its name, why did prisoners wear hoods, who started the giant engine of 1876, and what kept the skyline low for almost a century? The illustrations are old photographs, photochroms, engravings, lithographs, a plan, a watercolor and paintings in the public domain.