Our amazing planet

Imagine finding really old building structures that some people think were made by aliens! In Qinghai （青海）, China, there are special ruins that have caught the attention

The Great Barrier Reef （大堡礁） in Australia is the largest coral reef （珊瑚礁） on Earth and one of the seven wonders of the natural world. A

The Great Wall （萬里長城） of China is one of the biggest structures ever built by humans. It is about 13,171 miles (21,197 km)