The truth is, you can. This utopia has existed for 50 years, even; it’s called Auroville, and is located in Southern India.
The brainchild of Mirra Alfansa, Auroville is a universally welcoming place, regardless of nationality, culture, religion, or language.
Instead, it celebrates what we all are: Citizens of earth.
Alfansa created a charter by which the city runs, and no nation can claim property of the place. Instead, it belongs to the world.
There is no authority, legal or political, nor a person of power, that the inhabitants need to respect. There are no written laws either.
Instead, there is only one supreme universal truth by which the city runs; citizens work toward harmony, love, and acceptance, and prioritize education and research.
As a result, the functioning of the town is organized in a very modern and environmental friendly way. They have implemented systems of wastewater treatment, as well as systems of ground water depletion.
Auroville uses eco-friendly methods for production of organic food, as well as technologically advanced methods for making the poor soil fertile. With the time, the town has become self-sufficient when it comes to food production and drinking water.
Starting from the seventies, they have started a process of forestation, and today the city is settled within a belt of forests and fields, making it one of the cleanest places on earth.
Even crazier, Aurovillians use no money – they have a whole economy functioning on principles of sharing, giving, and exchanging.