Why was it such an achievement to circumnavigate the globe?

Circumnavigating the globe was a monumental achievement because it demonstrated significant advancements in navigation, shipbuilding, and geography during the Age of Exploration. It provided concrete evidence that the Earth is round and revealed the vastness and interconnectedness of the world's oceans and continents. This journey also facilitated the exchange of goods, ideas, and cultures, fundamentally transforming global trade and interactions. Additionally, it showcased human ingenuity and determination in overcoming the challenges of long sea voyages.