±«Óãtv

The Rainbow Mountains in China's Gansu province are about 80 million years old.

But before the turn of the millennium few people in China or the rest of the world had heard of the 500 square km (190 square miles) formation.
More than one million people visited the area in 2015.

The ±«Óãtv Travel Show's Rajan Datar finds out more.