Big Bend National Park. It can be seen for miles around, including from the porch of Terlingua Ghost Town's Starlight Theatre.The park's website says this about the Mule Ears Spring hike:
"3.8 miles roundtrip--This trail starts at the Mule Ears Overlook parking area at milepost 15 on the Ross Maxwell Scenic Drive. Always in sight of the prominent "mule ears" peaks, the trail crosses several arroyos before reaching the spring. A rock corral and cottonwood trees mark the end. Fantastic geology and spring wildflowers make this a delightful day hike."
For other regional hiking information, visit: www.texasmountaintrail.com/hike