Edinburgh: a volcano, a drained loch and a gun at one o'clock

Edinburgh is a capital built on the ruins of a volcano, divided into an Old Town of closes and towering tenements and a Georgian New Town laid out on a grid — and this quiz invites you to walk through its history in 20 questions with pictures.

What exactly is the rock under the fortress, and where does the city's name really come from? Who built its oldest surviving building, what legend explains the origin of the abbey at the foot of the Royal Mile, and how did a giant siege gun get here? Who was killed in the queen's rooms in 1566, and what made a congregation hurl stools in the city's great church in 1637?

What did people shout before emptying their slops out of the windows, what does 'Auld Reekie' really mean, and where were the old kingdom's crown jewels hidden for 111 years? What became of the loch that once lay below the fortress rock, what was the New Town's grandest avenue almost called, and what is the Mound made of? Who wrote almost all of the first great encyclopedia printed here, which famous tale grew out of a respectable deacon's double life, and what drove two West Port lodging-house keepers to murder?

Why does the copy of the Parthenon on Calton Hill stand unfinished, why did the designer of the great Gothic spire in the city centre never see it completed, why does a gun fire from the ramparts every day, and who was the master of the famous little dog of Greyfriars? The illustrations are old photographs, photochroms, engravings, woodcuts, paintings and a plan from the 17th to the early 20th century, all in the public domain.