A souvenir offers proof of travel while asking almost nothing about what the traveler understood.

The object confirms attendance. It says you were in the place, and asks nothing about whether you spoke to anyone, learned anything, or understood the first thing about where you were. Travel is easy to evidence and hard to demonstrate, and the souvenir sits comfortably on the easy side.

Bring back a fact or a conversation alongside the object. Write down one thing you did not expect. It is worth more later than the item, and it is the part that fades if it is not recorded.