Extremely Hard General Knowledge #19

What is the two-letter country code for Algeria?

Who is the namesake of Warsaw Airport in Poland?

How many years are in a lustrum?

What is the name of the longest river in New Zealand?

What was the name of the man who attempted to assassinate Ronald Reagan in March 1981?

Which Norwegian playwright's work include 'A Doll's House', 'Pillars of Society' and 'The Wild Duck'?

What is the largest city along the Amazon River?

Who had 3 Solo UK Number Ones with 'Too Many Broken Hearts', 'Sealed with a Kiss' and 'Any Dream Will Do'?

Who played Richard Bellamy in the ITV Drama 'Upstairs Downstairs'?

Which Celtic band was Enya a member of before going solo?

The smallest measurable distance is named after which German physicist?

How many cantons is Switzerland split into?

Who starred as Arthur Dent in the 2005 film adaptation of 'The Hitchhiker's Guide to the Galaxy'?

What do the C and S stand for in the author's name C.S Lewis?

In which year was the Domesday Book completed?

Who was the wife of George V until his death in 1936?

In the 1500's, who discovered that the Earth rotates around the sun?

Which Steven Spielberg film was nominated for 11 Academy Awards at the 1986 Oscars but didn't win any?

In the Bible, King David had the husband of which woman killed once he became infatuated with her?

Which stem vegetable translated from German means cabbage turnip?