Last Updated on December 1, 2019 We just got back from witnessing one of nature’s most breathtaking spectacles. High in the Sierra Madre Mountains west of Mexico City is the Monarch Butterfly Biosphere Reserve, a UNESCO World Heritage Site where migrating Monarchs from east of the Rockies throughout North America overwinter in a mountaintop forest of oyamel fir trees. Arriving around late November and staying… Read moreThe Marvelous Monarchs of Mexico