The Painted Hills are a truly bizarre and alien-looking landscape in Eastern Oregon. With rust, sand, tan, and grassy-colored layered hills, scarlet scarred slopes, and charming old-time towns dotted ...

Editor’s Note: CNN Travel’s series often carry sponsorship originating from the countries and regions we profile. However, CNN retains full editorial control over all of its reports. Read the policy.

It’s a place renowned for its stark beauty and otherworldly landscapes. Yet beneath the alien terrain of Anglesey’s Parys Mountain (Mynydd Parys) lies another world that’s every bit as strange and ...