James Fredrick

When hundreds of migrants from Central America waded across a river from Guatemala into Mexico on Monday, chaos broke out. And for Saury Vallecilla Ortega, a single mother of four, a nightmare ensued.

For more than a day, she was separated from her 5-year-old daughter, Andrea, and feared for the worst.

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AILSA CHANG, HOST:

Five-hundred years ago, two men met and changed much of the world forever.

About 500 Spanish conquistadors — ragged from skirmishes, a massacre of an Indigenous village and a hike between massive volcanoes — couldn't believe what they saw: an elegant island city in a land that Europeans didn't know existed until a few years before.

"It was all so wonderful that I do not know how to describe this first glimpse of things never heard of, seen or dreamed of before," wrote conquistador Bernal Díaz del Castillo.