Earthlings, tonight Jupiter and Venus will look beautifully close in the sky, visible to the naked eye. Here is Celestia and Stellarium showing a preview. If it’s cloudy, or if you’re not in the mood to glance the sky, don’t worry, you may have another opportunity in 24 years..
The Great Stalacpipe Organ at the Luray Caverns in Virginia. The keys in the console control solenoids which strike the stalactites with rubber mallets. The selected 37 stalactites spread over 3.5 acres (~14000 square meters), maybe the largest musical instrument by area. Created by the mathematician and scientist Leland W. Sprinkle in 1956..