I've always enjoyed Leo Villareal's "Multiverse" (2008) which is located between the East Building and the West Building of the National Gallery of Art in Washington DC. The work, made of light-emitting diodes, surrounds you as you are transported via a moving walkway.

In the recording, you can hear the sound of people chatting and laughing, (I swear I hear someone happily say "Jamiroquai!" towards the end), heels clacking as some choose to walk instead of using the walkway, and beginning at the eight-minute mark you can hear a child say "wow!" a few times. Their father is holding them in his arms and, as they get near, you can hear him sing the end of "Twinkle Twinkle Little Star".

Recorded by Bill McKenna.