Chimney Rock National Monument

Photo By: 000jaw via Wikimedia Commons

President Obama established Chimney Rock as a National Monument, using the authority of the Antiquities Act. Located in the San Juan National Forest in southwestern Colorado, Chimney Rock "has been a spiritually, ecologically, and culturally significant site for more than 1,000 years and remains of great importance to modern Pueblo Indians," according to the Sierra Club.

Devils Tower National Monument, in Wyoming, was the first land preserved under the Antiquities Act, by President Theodore Roosevelt in 1906.

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