How low can you go

Recent adventures had us primed for an exploration of the world's tallest towers but we couldn't resist a little more spelunking. A recent email (thanks again, JR) introduced us to Guatemala's 330-ft deep GIANT SINKHOLE (described here and here). And then we found our work had been done for us, thanks to this handy list of Large Holes by Virtual Tourism, which we will shamelessly borrow from:

MIRNY DIAMOND MINE, Siberia is the largest open diamond mine in the world and is visible from an extraordinarily high altitude.

KIMBERLEY Big Hole, South Africa is apparently the largest ever hand-dug excavation in the world.

This grainy VIEW doesn't offer much so we'll have to take their word for it that Belize has one of the better Blue Holes (image above). The deepest is Dean's BLUE HOLE, nearby in the Bahamas.

The Monticello Dam's GLORY HOLE spillway is used to drain the reservoir when the dam is at full capacity and creates an impressive negative space within a negative volume.

Lastly, we'll stop at the inverted mountain of BINGHAM CANYON MINE, Utah, begun in 1863 and supposedly the largest man-made excavation on earth. It has plenty of the classic MOTIFS we've admired before and, seemingly occupying two time zones, a nice dusting of SNOW at one end. Being in familiar SPIRAL JETTY territory, we thought we'd have a look around the Great Lake and found no shortage of salty eyecandy, including HERE, HERE, HERE and HERE.