Trivia Question of the day: What Japanese city was originally the intended second target - after Hiroshima - for the atomic bomb? Answer below.

In May 1775, Ethan Allen and his Green Mountain Boys, together with Benedict Arnold, captured the British-held Fort Ticonderoga. This Saturday, watch a reenactment from upstate New York. Watch on.@cspan 2 at 11pm ET.

#FlashbackFriday - 56 years ago, #Apollo11 mission astronauts Neil Armstrong, Buzz Aldrin, and Michael Collins were heading toward the moon. Apollo 11 landed on the moon July 20, 1969.

A famous female evangelist, a mysterious 1926 disappearance, and a nationwide media frenzy. Historian @clairedhoffman discusses the rise and fame of Aimee Semple McPherson, Saturday on @cspan 2 at 4pm ET

In 1969, Mr. Rogers testified before a Senate Committee to advocate for educational programming and public broadcasting funding. #ThrowbackThursday .

It's back - #FacialHairFriday! Who bearded best? RT for J.E.B. Stuart & ❤️ for Edwin Stanton. Want more Civil War history? Watch @cspan 2 everyday Saturday at 2pm ET:

Look for this airing on @cspan American History TV soon - part of our coverage of all things #America250.

"Sir, I hasten to inform you that an attempt is to be made on your life." .Daniel Feller, Andrew Jackson Papers editor, looks at the consequential events in 1834 (including this threatening letter) during Jackson's presidency. Watch more, Saturday at 9:30pm ET on @cspan 2

@cspan @AmPhilSociety How does an Englishman invite a dinosaur to have an afternoon refreshment?."Tea, Rex?".Watch "Dinosaurs at the Dinner Party".

#DYK The stars on the original American flag were in a circle so all the colonies would appear equal? Watch programs about the American Revolution in our @cspan video library:

1775 - Lead up to Revolution. Saturday, starting at 1pm ET historians and authors examine events of 1775 and daily life for colonists on the eve of the American Revolution. Hosted by @MHS1791, @AmPhilSociety, and the Concord Museum. #America250 #July4th

See George Washington prepare to leave @MountVernon, a reenactment of a Revolutionary War encampment and a battle between American colonists and British troops - Saturday at 6:30pm ET on @cspan 2

#OnThisDay in 1775, 250 years ago, George Washington took command of the Continental Army in Cambridge, Massachusetts. #America250. Watch programs about the American Revolutionary era all day on @cspan 2 this July Fourth.

Hint: the author of that quote is in this painting. Watch programs on the American Revolution all day on #July4th on @cspan 2, starting at 8am ET.

Which Founding Father thought that July 2 should be celebrated with "with Pomp and Parade, with Shews, Games, Sports, Guns, Bells, Bonfires and Illuminations from one End of this Continent to the other." Bonus points if you know why July 4 is celebrated instead.

How is the American president depicted on film and TV -- and what does that mean for how we understand the office? Filmmaker and screenwriter Rod Lurie shares his perspective at @WJCLibrary42. Watch more, Saturday at 9:30am/pm ET on @cspan 2

#DYK that @Harvard's first female professor Alice Hamilton attempted to expose the dangers of leaded gasoline? Hear more from @DanEnRoute, author of "American Poison," Saturday at 4pm ET on @cspan 2

#OnThisDay in 1948, U.S and British air forces began the Berlin Airlift - delivering food and supplies past the Soviet Union blockade to West Berlin.

"This was the most shocking event. of the late 19th century." The Battle of the Little Bighorn, also known as Custer's Last Stand, occurred #OnThisDay in 1876.

Can you imagine finding dinosaur bones. before everyone knew what a dinosaur even was?! Hear more from Edward Dolnick, author of "Dinosaurs at the Dinner Party" Saturday at 4:15pm ET on @cspan 2. Hosted by @AmPhilSociety