A flag resolution was adopted 248 years ago, on June 14, 1777, that said, "Resolved: that the flag of the United States be made of 13 stripes, alternate red and white; that the union be 13 stars, white in a blue field, representing a new constellation," according to the Smithsonian.

Celebrated each year on June 14, Flag Day commemorates the 1777 approval of a national flag design by the Continental Congress.

This Father's Day weekend brings another, more obscure holiday in the U.S.: Flag Day. Here's what the holiday is and how and when it started.