Yesterday I booked a trip from Buenos Aires to Sarajevo, with stopovers in Montreal, Antwerp, and Vientiane along the way. A little circuitous, sure, but it was free and it only took about eight minutes! I booked it via SoundTransit, and there are plenty more options. Pick your departure and destination points and how many stopovers you’d like in between. SoundTransit will give you your itinerary and present you with field recordings strung together from each location.
The field recordings are supplied by locals; if you’d like to supply a recording of your own city, you can contribute to the site and they’ll add your location to future itineraries.