This is the ambience of a washroom near the parking lot of a small business building. You can hear the hum of the air-conditioner and the distant chirping of a large flock of birds. I recorded this with my lenovo laptop's built-in microphone.
Alleyway behind a couple of huge older buildings at 3pm in downtown vancouver. Standing near output fan and building generator structures. At the end of the alley you can hear the busy traffic. Recorded with tascam dr-05.
Atmo of the portico of the national gallery in london. Lots of visitors from all over the world pass by, talking loudly. Recorded with a zoom h-2, mics set to 90° dispersion.