The Collins English Dictionary defines nostalgia as "an affectionate feeling you have for the past, especially for a particularly happy time." Although it can be bittersweet, nostalgia tends to evoke in people memories of a time long past that is both uniquely pleasant and irretrievable.

A new study led by the University of Cambridge in the UK has explored the physical places that people feel nostalgic about, the features those places have, and how reminiscing about them impacts our mental well-being.