The cleanest city I have ever visited. Sparkles like a quiet gem all night. The street-sweeping machines hum along at 3, 4, 5 a.m. The city is swept, dusted, polished, but the constant warm buffer of wind keeps it from being antiseptic. Home of Cadillac Ranch and the Helium Monument. Amarillo supplies the world with 90% of its helium, and is known as The Helium Capital of the World.