Blood Falls, Antarctica – Blood Falls stains the snow-white face of Taylor Glacier in Antarctica. Scientists say the mysterious red flow is caused by a subterranean lake rich in iron.
Magnetic Hill, Moncton, New Brunswick – Though ultimately an optical illusion and not a magnetic force, the sensation of rolling backward uphill without power on Magnetic Hill has drawn carloads of travelers to test this curiosity since it was discovered in the 1930s. This circa 1940 photo gives drivers instructions.
Surtsey, Iceland – Before 1963, the Icelandic island of Surtsey didn't exist. Then, an underwater volcano in the Westman Islands erupted, and when the activity settled down in 1967, what remained was an island where no island had been before.
Moeraki Boulders, New Zealand – Large spherical boulders that formed millions of years ago on the ancient sea floor now dot Koekohe Beach on the east coast of New Zealand's South Island. They're what geologists call septarian concretions.
Longyearbyen, Norway – From April 20 to August 23, the sun never sets over Svalbard, a Norwegian archipelago that lies north of Greenland in the Arctic Sea. Here, colorful cabins reflect the midnight sun in June in Longyearbyen, the capital of Svalbard.
Pamukkale, Turkey – The frozen-looking landscape in Pamukkale, Turkey, is actually the result of calcium carbonate deposits from 17 natural hot springs accumulating over thousands of years.
Racetrack Playa, Death Valley, California – Ordinary stones seem to "sail" over the dry earth, leaving a trail behind, in Death Valley National Park. The prevailing theory for this strange phenomenon involves ice that forms around the stones, causing them to move and to leave a trail in their wake.
Eternal Flame Falls, Orchard Park, New York – A golden flame flickers behind a small waterfall in the Shale Creek Preserve section of Chestnut Ridge Park. A geological fault allows methane gas to escape to the surface, where at some point a visitor set it alight.
Old Faithful, Yellowstone National Park, Wyoming – More than 300 geysers can be found throughout Yellowstone National Park's 3,472 square miles, and none is more famous than Old Faithful.
Relampago del Catatumbo, Ologa, Venezuela – Thanks to its humidity, its elevation and the clash of winds from the mountains and the sea, the southwestern corner of Lake Maracaibo in Venezuela has the world's highest frequency of lightning activity.