On this date in 1919, a massive molasses tank wreaked havoc in Boston in a flood never seen before or after. And in 1943, this date brought completion of the world's largest office building. Find out more on today's Mark Almanac.

In 1943, in the midst of World War II, President Franklin Roosevelt became the first to travel on official business by way of a new mode of transportation. And in 1952, a new show debuted on NBC that has been a mainstay ever since.

On this date in 1935, American aviator Amelia Earhart made history in the air. And in 1949, a rare weather event took place in Los Angeles. Find out more during today's installment of Mark's Almanac.

On this date in 1863, the first-ever underground railway opened in this city. And in 1956, Elvis recorded a new single for RCA that became a major hit. Find out more during today's Mark's Almanac.

On this date in 1982 NBC-TV aired a new show that was quite funny. And 700 million people worldwide use this product introduced in 2007. Get the scoop on today's Mark's Almanac.

On this date in 1806, the expedition of Lewis and Clarke took an interesting twist. And in 1835 under President Andrew Jackson, the national debt stood at an unbelievable balance. Find out more during Mark's Almanac.

On this date in 1608, the first widely-regarded officially documented "structure fire" occurred in this U.S. city. And in 1785, a Frenchman and American made history in the air.

On this date in 1887, a man by the name of Thomas Stevens made history on a bicycle. And in the music world, a new creation in 1936 helped pave the way for a way to gauge popular songs.

On this date in 1973 this man, born in Rocky River, Ohio, led a group of investors to purchase the New York Yankees from CBS for $8.7 million dollars. And Apple products made a major step in their company's history. Find out more on today's Mark's Almanac.

On this day in 1791 that an event known as "The Big Bottom Massacre" began. And on this date in 1929 the United States and Canada came together and made an agreement. Find out what it was during today's Mark's Almanac.