If you try to manually change the URL both your current environment and the one you teleport two will layer on top of each other.
For example, If you are at app.vircadia.com/#/antares.digisomni.com and swap the url for app.vircadia.com/#/nautatuma.vircadia.com the content of antares will persist when the content of nautatuma loads. Creating an inworld teleport yields the same results.