The second-largest canyon in the United States, Palo Duro Canyon slices through the flat plains near Amarillo, revealing 120 miles of colorful rock layers that tell a 250-million-year geological ...

On Sunday, emergency crews received a call around 12:45 p.m. local time from a group of hikers in a web of trails at Gold Canyon's Wave Cave Trail some 40 miles east of Phoenix. "No foul play is ...