A trip to Mussoorie should be on the cards if you&rsquove been searching for the perfect winter holiday plan. The winter season brings many gifts of nature, and the winterline phenomenon is one of them&ndashit is when a false horizon is formed at dusk caused by the refraction of light. The breathtaking view can only be witnessed from certain mountainous regions around the world, such as in Switzerland and back home in quaint Mussoorie, parts of Mizoram prominently.