Biosphere 2 is a groundbreaking research facility studying climate change and ecosystems inside an enclosed glass structure in the middle of the Sonoran Desert.

Outside the thriving desert mecca of Tucson in southern Arizona lies a little-known piece of aviation history among the local ...

Arizona is no stranger to weird and wild things. These nine landmarks were recently named the strangest in the state by World Atlas. Here's why.

Laguna la Cruz on the Gulf of California coast in Sonora, Mexico, is an important stopover point for many migratory species.

Environmental Day at the Arizona Legislature, conservation advocates talked about the issues they wanted lawmakers to address.

Sign the petition to show your support for all national monuments and for protecting monuments from mining and drilling.

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