Dwarves' Cave

I was asked today by a native of Dosdorf that this dwarf cave was built by a father for his children a long time ago, when he was still a child, so that they can enjoy being outside in nature. Furthermore, he told me that the way there is decorated with eggs etc at Easter and with tree decorations around Advent ... A fir tree even had a little jewelry on it ... I think that's a really good idea 👍

apparently lovingly decorated with dwarves by local residents. Unfortunately, there is no explanation/note about this place, which is a listed building

As the name suggests - it's a really small "cave" created by dwarf humans. Unfortunately, I don't know exactly what it is or what it was created for, the Internet has no advice on this.