Zuri Hall

Dennis Mong / NBC

We know how many. We just don't know who. NBC tells me that 13 contestants from the Cincinnati American Ninja Warrior finals airing Monday will advance to the four-week national finals in Las Vegas where the winner gets $1 million.

Who are the 13? We'll find out 8-10 p.m. Monday, Aug. 19, when NBC broadcasts the Cincinnati finals taped Memorial Day weekend. It was shot the night after filming the Cincinnati auditions broadcast July 8.

John Kiesewetter

It's like the circus rolled into town – a high-tech TV circus starring acrobatic ninjas cheered by hundreds of onlookers.

A dozen 18-wheelers hauled the rigging, lights and 32 cameras to The Banks for NBC's American Ninja Warrior obstacle course on Second Street, in front of the GE Global Operations Center building between Race and Vine streets.