See some of the most spectacular waterfalls from around the world.
Some of the oddest sites on our planet are below the surface.
Check out these shots of spectacular lighting and dramatic skies around the world.
About 1,500 volcanoes are active on our planet, though only about a third have erupted during recorded history. Here are some that potentially could pose a threat to major inhabited areas.
This week: Get a bird's eye view of Marrakesh, some midsummer atmospheric fireworks -- and a massive solar plant in China.
Views from around the world: Downpours pick up as the atmosphere warms and a star-shape fort is captured from space. Plus: Is the new Bay Bridge shaky?
These places look alien, but they're actually on Earth.
This week: A terrifying pathway in Spain, Greenland lakes that drain in hours and a spacecraft spots the first night-shining clouds of the season.
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