But the region's most popular slot canyons — like Antelope Canyon or the Narrows in Zion National Park — are getting so crowded that they can feel more like shopping malls than pristine ...

Accessible by guided tour only, Antelope Canyon is a unique geological structure formed by water erosion over millions of years. The slot canyon reveals deep, winding, bright orange and red ...

This footage, taken by Metron Films, shows Arizona's Antelope Canyon, an incredibly unique natural wonder that draws tourists from all over the world to Arizona. It's a slot canyon, which means ...