Antelope Canyon, Arizona- After you squeeze into the canyon you're met with a metal ladder to help you get to the bottom. Before the ladder was installed travelers had to rappel to the bottom, and there wouldn't be any way to get out of the canyon at the opposite end without a ladder. Photo by Travis Burke.

Antelope Canyon, Arizona- After you squeeze into the canyon you're met with a metal ladder to help you get to the bottom. Before the ladder was installed travelers had to rappel to the bottom, and there wouldn't be any way to get out of the canyon at the opposite end without a ladder. Photo by Travis Burke.

What Lies Beneath Stonehenge? A new Smithsonian Channel show reveals groundbreaking research that may explain what really went on there.

What Lies Beneath Stonehenge?

What Lies Beneath Stonehenge? A new Smithsonian Channel show reveals groundbreaking research that may explain what really went on there.

A river flows through volcanic ash, Iceland

Aerial photograph of a river flowing through a bed of volcanic ash in Iceland.

Inside the #CarinaNebula: Cropped from original 465 mb tif image. A towering “mountain” of cold hydrogen gas laced with dust is the site of new star formation in the Carina Nebula (NGC 3372). The great gas pillar is being eroded by the ultraviolet radiation from the hottest newborn stars in the nebula. This portion of the Carina Nebula is home to some of the most intense star formation in the Milky Way galaxy. Credit: NASA/Hubble

Inside the #CarinaNebula: Cropped from original 465 mb tif image. A towering “mountain” of cold hydrogen gas laced with dust is the site of new star formation in the Carina Nebula (NGC 3372). The great gas pillar is being eroded by the ultraviolet radiation from the hottest newborn stars in the nebula. This portion of the Carina Nebula is home to some of the most intense star formation in the Milky Way galaxy. Credit: NASA/Hubble

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