It reminded me both of Guell park in Barcelona and Hundertwasser Haus in Vienna. It is small - just around 1 hour there would do, but there are surprises there that I have not seen elsewhere. Ingenious structures. I liked it a lot and the kids loved it.
We made the route especially through there from Toscana to Rome. However I don't know if its so much worth the effort. If the other quicker road is boring for you... and if you have a spare 2 hours, then sure - go for it.
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