Don‘t know if this is the same but I went to Death Valley on the Devil‘s Golf Course during summer. There was no wind no nothing. It was so damn silent. Wonder how that compares to an anechoic chamber now.

Having experienced both, it's very similar.

Edit to add: I've been in an anechoic chamber and also the black rock desert, which is dead flat and thus has very little surface area oriented to reflect sound back at the listener, which makes it similar in that you don't experience environmental reflections.

Devil's Golf Course has more "texture" to it but if you were quiet on a windless day I think the effect would be similar.