Travel Advent Calendar 23 December 2019

We have made a travel advent calendar, today is the 23rd day. Every day we ask a question and give away a free tip on travelling in Norway.
Answer to yesterday's question: Ecuador and Chile.
Today's question: Which countries do not have a rectangular flag?
Today's tip: Do some urban exploration in Norway. There are safe and guided options like the Heavy Water Factory in Rjukan, but you can also explore on your own, like the mines in Spro near Oslo. Remember to be careful and only enter places open to the public.
Check back tomorrow for the answer to today's question and more travel tips.
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