Guess the capital city...

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Across
  1. 3. You can see the oldest working astrological clock in the world in this city.
  2. 4. Original name of this capital city was Serdika.
  3. 6. Capital city, which has the coldest average winter temperature out of all Nordic capital cities.
  4. 7. St. Valentine is buried in The Whitefriar Street Church located in this capital city.
  5. 8. The entire historical center of this capital city is fully recognized as a UNESCO World Heritage Site.
  6. 9. There is the world’s shortest funicular. This little trolley travels uphill a whopping 216 feet.
Down
  1. 1. This city became the capital in 1871, which is ten years after the unification.
  2. 2. This capital city was used to be a fishing village called Havn.
  3. 3. The nickname of this capital city is The city of lights.
  4. 5. This capital city is one of the oldest capital city in Europe.