I am using 'Possession' here in the sense of something you own.(Yes, it could be argued that the alternative meaning of something owning and controlling you is valid as well! But that's not where I am going.) Here I am talking about travel as a kind of 'stuff', in the George Carlin definition of something you need because it, somehow, completes you and makes you whole.
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I think that travel completes you and makes you whole. Like an education, travel is something you can buy -- but no one can ever take from you. It broadens your view of what the world, and its inhabitants, are. It opens you to experiencing differently. It gifts you with wonderful stories and requires only a willingness to step outside your comfort zone. It is adventure, sometimes with a red carpet and sometimes with a backpack and sometimes with an uncomfortable view of the underside of life.
And, when you get home, you are a better person for it.
Certainly there are those who go places and gain nothing from the journey. These are not brethren of the road, they do not travel. The traveller goes and is transported. The traveller's personal story gains a chapter. The traveller finds themself in unexpected places, in every sense of finding oneself.
Travel is a thing. Once you have done it, you own it. Once you have been there, you'll always have been there. Travel is that most beneficial of possessions: a tool for being.