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Having laid her eggs, an endangered leatherback turtle shuffles seaward on Florida's Singer Island. She escaped the confusion created for the turtles by the light from beachfront development that can lead them off course. But her hatchlings may…

Chicago at night burns bright under blankets of clouds. Much of the glow escapes from street lamps, including clear, Victorian-style lamps good for creating atmosphere but poor for harnessing today's extra-bright bulbs.

A globe-shaped fixture in downtown Toronto wastes most of its wattage over pedestrians' heads. Many fixtures can be ordered or retrofitted with reflectors that guide light down -- all at relatively little expense.

Avian victims collected over three months in Toronto and displayed for a school group at the Royal Toronto Museum total more than 1,000 birds of 80 species.

Artificial light from Toronto buildings confuses and traps birds, mostly low-flying songbirds. It is estimated that at least 100 million birds die each year in collisions with glass windows, baffling to birds both day and night.

Fourty-four xenon theatrical lights at its base give the stainless steel surface of the Gateway Arch in St. Louis a dramatic night sheen against a ruddy sky.

A starry night gleams over Owachomo Bridge in Utah's Natural Bridges National Monument -- named the first Dark Sky Park by the International Dark Sky Association. 'Here you see something forgotton,' says ranger Scott Ryan, 'and reconnect with the…

With 285 fixtures shining on 550 acres of runs, Oregon's Mount Hood Skibowl is the largest night ski area in the US. Proper spotlighting is paramount on after-hours trails, but the light falling on snow naturally bounces upward.

Plenty of earthly light bathes the Mormon temple in Bountiful, UT -- light that overpowers others in the community.

The electric blush of Salta Lake City, more than 100 miles away, brushes the horizon over Utah's Bonneville Salt Flats.