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Engineers work to replace machinery, prevent flooding and maintain antiquated equipment all while minimizing disruption at America’s busiest locks.

The former Secretary of the Interior helped establish the Pacific Crest Trail, four national parks – including one in Washington – and many groundbreaking environmental laws.

‘Forever chemicals’ linked to ailments from high cholesterol to cancer are in our clearest aquifers — but steep costs pose cleanup challenges.

Driven by climate change, more frequent blazes may change the way we hike, ski and camp.

Is it hard to go carless around the Sound? One frequent rider shares how to navigate one of the nation's busiest transit systems.

For decades, the Arlington radio station has helped the U.S. military communicate with its submarine fleet. It's also one of Russia's top nuclear targets.

Doing the work to make old buildings more energy efficient isn’t as sexy as filling our roads with electric cars, but these smaller efforts are making a difference.