In the creation story of the Dreaming, the Rainbow Serpent fashioned the earth and then returned to a spot east of the Kimberleys at a place where the rainbow meets the earth. The Rainbow Serpent's eggs fossilised and became what non-Aborigines now call the Devils Marbles. The Aborigines know them as Karlukarlu.
Because of this, the Devils Marbles Conservation Reserve is a spiritually significant and sacred site to the Aborigines.
Devils Postpile, California
Along the picturesque Middle Fork of the San Joaquin River at 7,600 feet on the western slopes of the Sierra Nevada lies Devils Postpile National Monument. This formation began when basalt lava erupted in the Middle Fork valley. As lava flowed from the vent, it filled the valley near the postpile to a depth of 400 feet. Surface cracks formed when tensions caused by the shrinkage of the cooling lava were greater than the lava's strength. Each crack branched when it reached a critical length. Ideal conditions allowed surface cracks to deepen and form long post-like columns.
And how it almost got blown-up!
Devils Postpile was once part of Yosemite National Park, but discovery of gold near Mammoth Lakes, California prompted a boundary change that left the Postpile on adjacent public land. A proposal to build a hydroelectric dam later called for blasting the Postpile into the river.
Influential Californians, including John Muir, persuaded the federal government to stop the demolition and in 1911 President Howard Taft made the area into a United States National Monument.
So yay, it didn't get blown-up!