Misc: Where is the original Harris tweed spun and woven?

Questions

Which John Wayne Western was described by a critic as, 'Grand Hotel on Wheels'?

Which principality has been ruled by the Grimaldi family since the 15th century?

Mary Donaldson was the first woman to hold which post?

Where in London is Rotten Row?

Which TV detective series is set in the town of Denton?