1) Mount Everest, located in the Himalayas, is the highest peak on Earth, with an elevation of 8,848 meters (29,029 feet). It is a popular destination for mountaineers and represents a significant challenge due to its extreme altitude and harsh weather conditions.

2) The Treaty of Tordesillas, signed in 1494, divided the newly discovered lands outside of Europe between Spain and Portugal, leading to the colonization of the Americas.

3) The blue whale is the largest animal to have ever existed, with an average length of about 82 feet (25 meters).

4) The construction of the Great Wall of China began in the 7th century BC and was completed over several centuries, spanning thousands of miles.