Ruins stand as reminders. Memory is always incomplete, always imperfect, always falling into ruin; but the ruins themselves, like other traces, are treasures: our links to what came before, our guide to situating ourselves in a landscape of time. To erase the ruins is to erase the visible public triggers of memory; a city without ruins and traces of age is like a mind without memories. 

Solnit, R (2007) The Ruins of Memory