One way I keep the memory of past trips alive is by buying staple accessories and clothing while travelling. That way, I'm continually wearing little reminders of the places I've been.
A good example of this is the rose-gold thumb ring I picked up at CatBird in Williamsburg during my trip to New York last summer. I wear it almost every day, and every time I look down at it, I'm reminded of my time in there.
The Michael Kors wallet, another item that gets everyday use, was purchased on my trip to Vegas last spring. If you'd like a more detailed guide on souvenir buying during trips, there's a full post here, where I featured the wallet for the first time.
Are there any items in your closet attached to travel memories?