The unassuming exterior of the INTEGRATRON in Landers, California near Joshua Tree National Park in the Mojave Desert.
Ok, so what the bloody hell is the Integratron? From www.integratron.com/:
"The Integratron is the creation of George Van Tassel, and is based on the design of Moses’ Tabernacle, the writings of Nikola Tesla and telepathic directions from extraterrestrials. This one-of-a-kind building is a 38-foot high, 55-foot diameter, non-metallic structure originally designed by Van Tassel as a rejuvenation and time machine. Today, it is the only all-wood, acoustically perfect sound chamber in the U.S."
Supposedly the structure sits atop a geomagnetic anomaly on the Earth's surface (the conspiracy theorists like to call this a 'vortex' even though you don't get sucked in and at least to me there's no discernible difference from anywhere else on the planet). Inside, though, the dome is truly 'acoustically perfect', and a friend's viola performance sounded, well, out-of-this-world...
Some more interesting reading at these links: