Stonehenge in the UK
The great pyramid at the Giza plateau in Egypt
And the earth pyramids at Xi'an in China.
Update: Forget that, it's back.
The distance to the locations is quite remarkable.
Giza is almost exactly on the other side of the planet. 20.000km
The distance to the Xi'an pyramid is about the same as the diameter of earth.
And to Stonehenge it is just 24km more than precisely 16.666,66km
Also I measured the obelisk more accurately. It's 4100m from the seabed, and 1200m below sea level. And the hole that goes in the ground at its base is 12km below sea level. The sea floor is at 5100m below sea level. It width is only about 150 to 250m.
The video is a recording of these measurements.
Update 21-9-2012: I found an other spike in the same region, but this one does come above sea level. This makes the possibility of an error in the 3D model a lot more likely in my opinion. I'll make a short vid of this new spike later.