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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 June 25, 2021

A picture of the Hoover Dam.
CAROL M. HIGHSMITH
/
LIBRARY OF CONGRESS
The Boulder Dam, now known as the Hoover dam.

It was on this date in 1929 that President Herbert Hoover authorized the Boulder Canyon Project Act, approving the building of the Boulder Dam. The structure is now known as the Hoover Dam in honor of the former president.