Longest known cave passageway

Miki Wonderland

πŸŽ’πŸ°πŸ’­’On 9 September 1972, In Kentucky’s Mammoth Cave National Park, a Cave Research Foundation exploration and mapping team discovers a link between the Mammoth and Flint Ridge cave systems, making it the longest known cave passageway in the world.‘

The first ship to circumnavigate the world

Miki Wonderland

πŸŽ’πŸ°πŸ’­’On 6 September 1522, the Victoria, the only surviving ship of Ferdinand Magellan’s expedition, returns to SanlΓΊcar de Barrameda in Spain, becoming the first ship to circumnavigate the world.’

The day that began the electrical age

Miki Wonderland

πŸŽ’πŸ°πŸ’­’On 4 September 1882, Thomas Edison flips the switch to the first commercial electrical power plant in history, lighting one square mile of lower Manhattan. This is considered by many as the day that began the electrical age.‘