Astrid Kirchherr was just 22 years old when she attended a concert that would change her life forever: a band from Liverpool, England was playing at a club in her native Germany, and what she saw shocked her.

"It was like a merry-go-round in my head. They looked absolutely astonishing," Kirchherr said in a press release. "My whole life changed in a couple of minutes. All I wanted was to be with them and to know them."

That band, of course, was the Beatles. And after that night, Kirchherr got to know them very well, eventually following them as a photographer through Hamburg, Germany in 1960 and again during the filming of "A Hard Day's Night" in 1964. She even began a relationship with original Beatles bassist Stuart Sutcliffe, and they were engaged when he died in 1962, notes the Los Angeles Times.

The photos she took during her time with the band eventually...