My greatest world destination

Huanglong is a scenic and historic interest area in the northwest part of Sichuan, China. It is located in the southern part of the Minshan mountain range, 150 kilometres (93 mi) north-northwest of the capital Chengdu. This area is known for its colorful pools formed by calcite deposits, especially in Huanglonggou (Yellow Dragon Gully), as well as diverse forest ecosystems, snow-capped peaks, waterfalls and hot springs. Huanglong is also home to many endangered species including the Giant Panda and the Sichuan Golden Snub-nosed Monkey. Huanglong was declared a World Heritage Site by UNESCO in 1992.

Madagascar, officially the Republic of Madagascar and previously known as the Malagasy Republic, is an island country in the Indian Ocean, off the southeastern coast of Africa. The nation comprises the island of Madagascar (the fourth-largest island in the world), as well as numerous smaller peripheral islands. Following the prehistoric breakup of the supercontinent Gondwana, Madagascar split from India around 88 million years ago, allowing native plants and animals to evolve in relative isolation. Consequently, Madagascar is a biodiversity hotspot; over 90 percent of its wildlife is found nowhere else on Earth. The island's diverse ecosystems and unique wildlife are threatened by the encroachment of the rapidly growing human population.

The Canadian Rockies comprise the Canadian segment of the North American Rocky Mountains range. They are the eastern part of the Canadian Cordillera, extending from the Interior Plains of Alberta to the Rocky Mountain Trench of British Columbia. The southern end borders Idaho and Montana of the USA. The northern end is at the Liard River in northern British Columbia.

The Canadian Rockies have numerous high peaks and ranges, such as Mount Robson (3,954 m (12,972 ft)) and Mount Columbia (3,747 m (12,293 ft)). The Canadian Rockies are composed of shale and limestone. Much of the range is protected by parks and a World Heritage Site.

Zakynthos or Zante (from Venetian) is a Greek island in the Ionian Sea. It is the third largest of the Ionian Islands. Zakynthos is a separate regional unit of the Ionian Islands region, and its only municipality. It covers an area of 410 km2 (158 sq mi) and its coastline is roughly 123 km (76 mi) in length. 

My second choice, in greatest world destination, definitely is Bora Bora island. Because photos after this article is the best argument for this constatation.

First choice of my greatest destination, definitly is Grand Canyon. The Grand Canyon looks great in the pictures , and this is one of the first destination would I like to visit.