Mourners, many of whom had lined up before dawn, began filling the square as soon as it opened with a salvo of 21 cannon shots from a colonial fort overlooking Havana harbor.
They filed past a black-and-white picture of "El Comandante" as a young revolutionary, many clutching bouquets of flowers, many others in tears.
"I got here at 6:00 pm yesterday. I don't know what to say," said Josefina Vayan Bravo, a 44-year-old housewife, before breaking into sobs.
While some saw him as a socialist hero who brought education and free health care to this country, others labeled him a "dictator" who caused economic hardship and sparked an exodus of Cubans to Florida seeking a better life.
Hundreds of thousands of people are expected to swarm Revolution Square, where Castro would often rail against the US "empire" during his legendary, marathon speeches.
Many mourners were dressed in state uniforms -- school children, soldiers, veterans, doctors and customs officers.
"He's the father of all Cubans. My dad was my dad, but he couldn't give me what (Castro) gave me. He gave me everything. My freedom. My dignity," she said.
"There will never be another like him," said 84-year-old Teresa Oquendo between sobs.
In a sign of changing times, US President Barack Obama visited Revolution Square during his historic visit to Havana in March, when he became the first US leader since 1928 to step foot in Cuba.
In 2014, Fidel's brother and successor, Raul Castro, announced a diplomatic detente with Obama, who has lifted some trade barriers. Today, the first regular flights from the United States to the Cuban capital will resume.
"If Cuba is unwilling to make a better deal for the Cuban people, the Cuban/American people and the US as a whole, I will terminate deal," he said on Twitter.
Raul Castro has enacted modest, slow reforms that have slightly opened up the economy. Government opponents hope that Fidel's death will prompt him to launch bolder changes.
Disclaimer: No Business Standard Journalist was involved in creation of this content
