nostalgia
nostalgia , noun
[New Latin, from Greek {not transcribed} a return home + {not transcribed} pain.]
1.
(Medicine) Homesickness; esp., a severe and sometimes fatal form of melancholia, due to homesickness.
2.
A sentimental yearning to return to an earlier time remembered as happier or more pleasant, or a former place evoking happy memories; a longing to experience again a former happy time; as, a nostalgia for the brotherhood of the Woodstock music festival; a nostalgia for the comradeship of one's college friends.