I have come across people preserving some old articles with them, which although of little day to day use to them today, they would still like to retain. I myself would love to retain any old article Ex: My Grandpa's notebook, or a favorite pen of mine I used in my school days. It would also be very hard for me to simply put the pen in dustbin. Another example is the craving to go back to the place where you once spent your glorious years as a carefree child or to make a trip to a historic place of your ancestral association. Another example is the protests or hesitation to demolish ancestral house or historic public buildings which may be old and also in ruins today
I see that apart from being an idealized form of the past which in reality might never have been so ideal, there are other distortions like compromising on the facts of the past, in addition to sometimes even leading to some sort of a waste of time, and downright clutter in your room as far are such feelings are concerned. Still this phenomenon is so common, and seems to be almost a part of every individual's life, although differing in degrees and intensity.
So my question is, what is the use of this feeling, and what is the evolutionary advantage of having such a feeling?