Misc: Where were the 1972 Summer Olympics?

Questions

What, according to tradition, will leave Gibraltar before the British?

What did Winston Churchill describe as 'a riddle, wrapped in a mystery, inside an enigma'?

What was the 5th largest city in the Roman Empire in 50 AD?

What country did the houses of Rurik and Romanov rule?

What must be in position before the House of Commons can sit?