​Cleveland is back!

CLEVELAND -- a historic American city on the shore of Lake Erie at the mouth of the Cuyahoga River -- hasn't received much respect in recent years. But with Republicans holding their convention in Cleveland this week, we asked our Mo Rocca to take a closer look:

In 1924, John Phillip Sousa rocked the new Public Auditorium in Cleveland, host to the Republican National Convention.

"Calvin Coolidge strongly advocated for Cleveland because Warren G. Harding, who had recently died, was an Ohioan," said historian John Grabowski, the author of "The Encyclopedia of Cleveland History." "Cleveland is also a great place at this time -- the fifth largest city in the nation."

The delegates attending the 1924 RNC were therefore visiting a city "on the rise."

"If they went out to the east they could've seen this new planned suburb, Shaker Heights, being built by the Van Sweringen brothers," said Grabowski. "They would've looked around and seen all the construction for the Cleveland Union Terminal."

Since that heyday, it's been a long nine decades for Cleveland, with some ups and a lot of downs, perhaps none more unfortunately symbolic than when the Cuyahoga River caught on fire (and not for the first time).

"The city became a national joke," said Grabowski, transforming from "the best location in the nation" to "the mistake on the lake."

"We were told since we were kids that we were in a lousy town, that this city wasn't great," said comedian Mike Polk Jr., who grew up in Cleveland.

Polk's satirical Cleveland tourism videos have racked up almost 20 million views on YouTube:

Rocca asked, "So you think Cleveland being at times the butt of jokes, helped shape your sense of humor?"

"I do. I think it helped build a callous. And I think that it gave some perspective that some other people might not have."

A campaign stop at Slyman's -- famous for its huge corned beef sandwiches -- will test your appetite for higher office. "You gotta really wanna be president to eat this," said Rocca.

"Exactly," said Polk. "Yeah, we'll see how bad Hillary wants it. I think Trump will probably -- He will eat this whole sandwich right in front of us, I think, out of spite."

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Mo Rocca sits down with Mike Polk Jr., and a huge corned beef sandwich, at Slyman's, a Cleveland institution.

CBS News

Polk says downtown Cleveland's gotten a lot better lately, though many of its architectural treasures are reminders of Cleveland's long-ago Golden Age.

"Cleveland really hit its industrial heyday in the years after the Civil War, and huge fortunes were built," said Grabowski.

Cleveland, it turns out, took an early lead in the manufacturing of motor vehicles. Scottish immigrant and Clevelander Alexander Winton was already making and marketing his Winton Motor Carriages in 1898. Its logo -- a tilted O -- screamed forward motion.

Winton was just one of a number of automobile companies that thrived in Cleveland during those early days. So, why didn't Cleveland become the automotive capital of the world?

"Well, I would say that Cleveland was the original motor city," said antique car enthusiast Bernie Golias.

Among other Cleveland milestones: the first electric streetcar line; the first blood transfusion; and one of the first traffic signals -- innovations that made great fortunes for some residing along Euclid Avenue, once called Millionaires' Row, and changed the way people lived everywhere.

Grabowski says Cleveland was the Slicon Valley of its time: "In its own way it was, because there was so much invention going on here. There was so much disruptive technology being created."

Two Clevelanders and next-door neighbors on Euclid, Anson Stager and Jeptha Homer Wade, were co-founders of Western Union Telegraph. "That's disruptive technology!" said Grabowski. "It's the Victorian Internet."