Short answers, pulled from the story.
The Georgia General Assembly legally recognized the community of Marietta on the 19th of December 1834. Early settlers had built homes near the Cherokee town of Big Shanty before that year.
The city was named for Mary Cobb, the wife of U.S. Senator Thomas Willis Cobb. Business boomed when officials selected Marietta as the hub for the new Western and Atlantic Railroad.
James Andrews came to Marietta in April 1862 along with a small party of Union soldiers dressed in civilian clothing. They stole an engine called The General but were caught within two weeks and hanged as spies.
Leo Frank was lynched at 1200 Roswell Road just east of Marietta on the 17th of August 1915. A mob abducted him from prison and drove him to Marietta to hang him.
The Marietta Confederate Cemetery holds the graves of over 3,000 Confederate soldiers killed during the Battle of Atlanta. This cemetery serves as a major historical site within the city limits.