Tucson

If we leave now, we could be back in Tucson before nightfall.

Southwestern cities like Phoenix and Tucson have some of the fastest-growing populations in the country.

The Arizona congresswoman was shot at a 2011 event in Tucson.

There have been inroads against ever growing urban illumination. The International Dark Sky Association in Tucson, Arizona, a group that claims 3,600 members in more than 70 countries, says efforts to curb excess light are under way from the Australian Outback to Britain's Sherwood Forest. In the Czech Republic, an anti-air pollution law also fights light pollution by requiring shielded fixtures to block upward beams. Laws have also been enacted in Chile, thanks to persuasive astronomers who staff the three big observatories there.