Wow. The Manicouagan impact crater is huge. Apparently it’s one of the largest impact craters still preserved on the surface of the Earth, and was formed during a tremendous impact about 200 million years ago. The annular lake that shows the perimeter is 70 kilometers (43 miles) in diameter. Solarviews.com says:

Although the original rim has been removed, the distribution of shock metamorphic effects and morphological comparisons with other impact structures indicates an original rim diameter of approximately 100 kilometers (62 miles).

Thanks to Mike Scher, Philippe, Keith, Stuart Reid, Andy M, Markus and many others.

This is Calgary Tower in Calgary, Alberta, Canada. At 190 metres, slightly taller than the Space Needle, so I’m told.

Thanks to Jordon and Jonathan Wilkins.

The runways are painted like a street at the former Naval Air Station at Alameda, CA to create a temporary freeway built for the big chase in The Matrix: Reloaded. There’s also some ground level shots of the freeways construction (scroll down to “behind the scenes”).

Thanks: Dan Wood & Tim Smith

Oregon’s spectacular Crater Lake is (at its deepest) 1,932 feet deep — the deepest lake in the United States. The lake is in a volcanic caldera that was formed 6900 years ago by the collapse of the volcano Mount Mazama. You can also see the lake’s Wizard Island in this photo.

Thanks: Jim Heid