This amazing terrarium is over two decades old and has never been opened. Redditor pj fry jr posted pictures of the sealed mason jar terrarium that he built and constructed twenty one years ago. Fellow redditor clearlight identified the plant he chose as the Tradescantia Fluminensis, a potentially invasive species that is nicely contained within pj fry jr's terrarium.

Further down in pj fry jr's original post, redditor leefyg posted this picture of his 18 year old terrarium.

If you'd like more information on how to create your own sealed terrarium, you can start with these links. I'm making mine this weekend. 

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