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Mark Pennell sits at the helm of his time machine.Mark's Almanac is a 90-second time travel that highlights the world's history from the very serious to the sometimes sublime.

Mark's Almanac for May 3, 2021

A picture of the Sears Tower being built.
The Sears Tower during its construction in 1973.

It was on this date in 1952 that USAF Col. Joseph Fletcher became the first man to unofficially visit the North Pole. And it was on this date in 1973 that a topping-out ceremony took place on the Sears Tower (Now, the Willis Tower) in Chicago to mark the building's completion.