Just like yourself, I had no idea what Plyos was, or why someone would go there. It is almost in the middle of nowhere in Russia, and has a very small population of about 2300 (according to wikipedia).
What you get to see in Plyos, is a beautifully scenic town by the river… old-Russian style.
About 120 years ago, a Russian painter from Moscow, Isaac Levitan, came across the hills of this town, and decided to start painting it all.
Upon displaying and selling his paintings back in Moscow, Isaac Levitan became incredibly famous, and the town of Plyos became a ‘Dacha’ or Cottage resort town.