Top Natural Wonders of World

1. Great Barrier Reef, Australia
2. Amazon Rainforest, South America
3. Grand Canyon, USA
4. Sahara Desert, North Africa
5. Galpagos Islands, Ecuador
6. Ngorongoro Crater, Tanzania
7. Halong Bay, Vietnam
8. Iguazu Falls, Barzil

You can not stop yourself saying "Oh My GOD".

Halong Bay is my favourite place in the entire world ! Spent 2 weeks in Vietnam but we had to go back to Halong Bay so we could spend 3 nights out there !

More Natural Wonders, give reason to love our blue planet.

Monarch Butterfly Reserve
Sanqingshan National Park
Lagoons of New Caledonia
Joggins Fossil Cliffs
Surtsey
Swiss Tectonic Area Sardona

I think you have forgotten to mention 1 most important place to visit that is, Tajmahal, Agra, India.
It is referred as world's 7 th wonder , so without visiting this place nobody can make complete his world tour.

Socotra a island off coast Yemen with it's strange diversity of  flora and Fauna it is a Natural Wonders of World. Recognised by the (UNESCO) as a world natural heritage site in July 2008

Yeah i agree with debaditiweb here, Tajmahal is widely considered as one of the most beautiful buildings in the world and stands as a symbol of eternal love. You really can not complete your world tour without visiting Agra's Tajmahal!!