Nellie Bly was an American investigative journalist and adventurer. She is best known for her undercover reporting, including her famous exposé on the conditions at the Women's Lunatic Asylum on Blackwell's Island. Bly's fearless and groundbreaking reporting paved the way for investigative journalism. She went undercover to expose corruption, inequality, and abuse. Bly's work brought attention to social issues and helped bring about reforms in various institutions.