On History Daily, host Lindsay Graham (American Scandal, American History Tellers) takes you back in time to relive pivotal moments that shaped history. In this special teaser, Graham revisits the tragic events of January 28, 1986, when the space shuttle Challenger broke apart just 73 seconds after liftoff, claiming the lives of all seven astronauts on board.

We also explore March 23, 1806, when Lewis and Clark, having completed the first U.S. overland expedition to the Pacific Ocean, begin their long journey back to St. Louis, Missouri.

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