Škocjan Cave, Slovenia. We couldn't take pictures on the tour, so you'll just have to imagine a path winding along the side of giant cavern and crossing a narrow bridge a hundred feet over a cascading underground river.

Camera model		Canon EOS DIGITAL REBEL
Shutter speed		1/20
Aperture		f/3.5
Maximum aperture		f/3.5
Exposure bias		0.00
Exposure		Normal program
Focal length		18mm
Flash		Off
Metering		Pattern
ISO sensitivity		800