The Sudbury Neutrino telescope in Canada. The 12-meter sphere contains 12,000 detectors that watch for the light from neutrinos that streak through the water filling the interior of the sphere. (Courtesy - Stanford Solar Center)
This image appears in the #59: Where did all the Neutrinos go? Technology Through Time article.
The most powerful solar flare in the last 500 years occurred on September 2, 1859 and was sighted by two astronomers who happened to be looking at the sun at exactly the right time!