take a stroll down memory lane
US /teɪk ə stroʊl daʊn ˈmɛm.əri leɪn/
UK /teɪk ə stroʊl daʊn ˈmɛm.əri leɪn/

1.
to remember happy times in the past
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Let's take a stroll down memory lane and look at old photos from our college days.
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Grandma loves to take a stroll down memory lane whenever we visit.