TARAKANIV, Ukraine – The ruins of the diamond-shaped Tarakaniv Fortress, tucked away into the hill and surrounded by trees, is hard to spot from far off. But if you are driving between Kyiv and Lviv, you may want to take a few minutes or hours to stop by and have a look. The abandoned fortress was built in the 19th century to defend the Russian Empire’s Western flank from a possible German or Austro-Hungarian attack.