The staircase at the Three Sisters in the Blue Mountains, NSW

The staircase at the Three Sisters in the Blue Mountains, NSW in September 2017

A rainbow and the Three Sisters at the Blue Mountains, NSW

A rainbow and the Three Sisters at the Blue Mountains, NSW in September 2017

A majestic rock formation at the Blue Mountains, NSW

A majestic rock formation at the Blue Mountains, NSW in September 2017

The Three Sisters seen from the Echo Point lookout at the Blue Mountains in NSW, Australia. Stunning late afternoon light

The Three Sisters seen from the Echo Point lookout at the Blue Mountains in NSW, Australia in September 2017

Tourists at the Echo Point lookout looking at the Three Sisters at the Blue Mountains in NSW, Australia

Tourists at the Echo Point lookout looking at the Three Sisters at the Blue Mountains in NSW, Australia in September 2017

One of the Three Sisters in the Blue Mountains, NSW Australia

One of the Three Sisters in the Blue Mountains, NSW Australia in September 2017

The bridge to the Three Sisters in the Blue Mountains, NSW Australia

The bridge to the Three Sisters in the Blue Mountains, NSW Australia in September 2017

Fon climbing a steep staircase in the Blue Mountains, NSW Australia

Fon climbing a steep staircase in the Blue Mountains, NSW Australia in September 2017

Huge cliffs rising out of a gorge in the Blue Mountains, NSW Australia

Huge cliffs rising out of a gorge in the Blue Mountains, NSW Australia in September 2017

People crossing the bridge to the Three Sisters in the Blue Mountains, NSW Australia

People crossing the bridge to the Three Sisters in the Blue Mountains, NSW Australia in September 2017

A cliff face in the Blue Mountains, NSW Australia

A cliff face in the Blue Mountains, NSW Australia in September 2017

Woman standing on the bridge to the Three Sisters in the Blue Mountains, NSW Australia

Woman standing on the bridge to the Three Sisters in the Blue Mountains, NSW Australia in September 2017

The Three Sisters in the Blue Mountains, NSW, Australia

The Three Sisters in the Blue Mountains, NSW, Australia in September 2017

The Three Sisters at the Blue Mountains in NSW Australia

The Three Sisters at the Blue Mountains in NSW Australia in September 2017