Belfast: a leaning clock, a linen city and the shipyard of Titanic

Belfast grew from a sandy river crossing into the busiest manufacturing city in Ireland, and many of its landmarks hide a surprise. This quiz invites you to test what you know about the city in 20 questions with pictures.

Why is the Victorian memorial clock on Queen's Square out of true, what does the Irish name of the city really mean, and why does a bell appear on its coat of arms? Which nickname did Belfast's most famous cloth earn it, what was built where the old cloth exchange stood, and how did the Corporation pay for its domed civic palace of 1906?

Which older university inspired the design of Queen's, which glasshouse did the maker of the Palm House build next, and what was named after a physicist born here in 1824? Why did a Belfast vet lose the patent on his son's new wheels? Which other landmark came from the firm that built the great gantry over Olympic and Titanic, how was Titanic named on the day of her launch, and which of the shipyard's men died with her?

Where does the cruiser launched on St Patrick's Day 1938 lie today, and where did help come from on the night of the worst air raid in 1941? What do locals see in the cliffs of Cave Hill, what happened to the first Belfast Castle, who owns the most ornate Victorian pub in the city, what came of the harpers' gathering of 1792, and which world-famous children's books were written by a Belfast-born author?

The pictures are old photographs and colour photochroms, engravings, a hand-drawn map, a postcard, portraits and a few modern photographs, all in the public domain.