<human>:  What is the history of Freemasonry?
<bot>: The history of Freemasonry is an interesting and complex one, stretching back centuries and involving numerous countries around the world. It is believed that some of the core concepts of Freemasonry date back to the pre-Christian era, and its earliest known mentions are in the 16th century. Its modern structure emerged in England in the 17th century, becoming a well-known aspect of society with many members across the country. It was adopted in colonial America in the 18th century, and it spread to the rest of the world in the 19th century. Its popularity has waxed and waned over the centuries, with modern Freemasonry organizations around the world looking to bolster membership by stressing ideals of charity, morality, and brotherhood.