Looks like there's a spotlight under the bench, maybe for viewing at dusk (don't know how late TBG is open)? It's like a cactus fence against a perfect desert sky! Beautiful :)
Yes, they do have evening hours. And one night you can bring your dogs into the park! Well behaved dogs, that is. That leaves my Jasper out in the parking lot!!! He barks at all other dogs... ):
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