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I believe this was on the Moth Radio Hour. It was about a family with two kids who find a portal in their garden. They go through it, and it goes to different places. The only one I remember is it taking them to an alternate dimension similar to theirs. They came out in a parking lot behind the local library. I believe the people in this world looked strange. They began to feel ill, so they left. they also went to a place fill with dangerous, unpleasant gas, which they quickly left. Over time, the portal wold take them to worse and worse places, until the family eventually lost interest and stopped going through the portal. I think it may have been a section from a larger book.