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The blowhole at Wupatki Pueblo, Wupatki National Monument.

Blowholes are formed when cracks in the rocks connect and form large, winding, narrow subterranean chambers. The surface holes react to changes in temperature and air pressure - they blow cold air out when there's warm or low-pressure air above and suck air in when there's cold or high-pressure air above.

These blowholes are all over northern Arizona but geologists have not yet been able to map how extensive they are or whether or not many of them are interconnected. Archeologists don't yet know what purpose they served to the Ancestral Puebloans, although many larger pueblo settlements have been found near the formations.