... that the Great Barrier Reef, located in Australia, is the world's largest coral reef system and can even be seen from space?
... that Marie Curie was the first person ever to be awarded two Nobel Prizes in different fields - physics and chemistry?
... that the ancient city of Petra in Jordan was carved entirely out of stone and was once a bustling trading hub on the Silk Road?
... that the tallest mountain in the world, Mount Everest, is located in the Himalayas and stands at a height of 29,029 feet?
... that the Great Wall of China, constructed over centuries and spanning over 13,000 miles, was designed to protect China's northern borders from invasion?
... that the Mona Lisa, painted by Leonardo da Vinci, is one of the world's most famous and valuable works of art?