Share the knowledge
I like making new traditions so when I first started travelling I came up with three things I always do to remember the places I've visited.
1) Save a Bill
I always keep the lowest denomination paper currency. several years later I found a clear frame on both sides. I placed all the bills I had collected and hung it on my wall. If you visit my home you can take it off the wall and check out the backside of the bills too.
2) Discover New Music
I love local music sung in the native tongue so when I hear a song I like, I ask someone nearby who's singing and purchase one of the muscians albums. I try to find contemporary music, classic, and traditional folk. When friends visit me, we'll talk about my travels, eat some traditional foods, and play some native music to set the mood.
3) Buy Art
I'm not looking for anything fancy. In fact I typically prefer something you can find from local street artists. I've purchased small sculpures, ceramics, freshly created paintings, and even some wooden carvings. Whenever I look at a piece of art I've brought back home, it reminds me of where I was, the person who created it, and how I felt at the time.
Consider adopting these three travel traditions or starting your own the next time you travel. It helps cement the experience within your memory and share it with others.