Source: Wikipedia
The Mona Lisa is the most famous painting on the planet by a distance that is hard to overstate. It draws millions of visitors to the Louvre annually, and…
Source: Wikipedia
Mount Rushmore is among the most photographed monuments in the United States: four presidential faces, each roughly 60 feet tall, carved into granite in the Black Hills of South…
Source: Wikipedia
Stonehenge is among the most studied structures on the planet. Construction began around 3000 BCE and continued in phases across roughly two millennia, and the monument has been surveyed,…
Ordinary lightning is well understood. It is a fast, enormous electrical discharge, it lasts a fraction of a second, it leaves physical traces, and it can be measured, photographed, and…
In the Southern Hemisphere summer of 1997, a team from the National Oceanic and Atmospheric Administration was doing routine work: monitoring an array of underwater microphones, or hydrophones, positioned to…
Source: Wikipedia
From ground level they are odd but unremarkable: bare, roughly circular patches of soil in dry grassland, each one somewhere between two and fifteen meters across, fringed by a…