Daredevil American tightrope walker Nik Wallenda Sunday night successfully completed back-to-back high-wire walks above the city of Chicago, watched by thousands of people. The 35-year-old achieved the two skyscraper crossings without a safety net or a harness-- a breathtaking event carried live on television.

He first walked up a steep incline between buildings either side of the Chicago River. Then, blindfolded, he crossed between the two Marina City towers."I love Chicago, and Chicago definitely loves me. What an amazing roar," the 35-year-old said as he crossed above the Chicago River. The walk consisted of two parts, starting from Marina City's West Tower, about 588 feet high. He crossed above the Chicago River to the Leo Burnett Building in just under seven minutes, finishing 671 feet above the street, according to Skyscraper Live's website. After he returned to the West Tower, he crossed to the East Tower blindfolded in one minute and 20 seconds. As a member of the famous Flying Wallendas, founded by his grandfather Karl Wallenda in the 1920s, Wallenda is no stranger to death-defying stunts. He walked across a wire 1,500 feet above a river in Arizona in June 2013, becoming the first person to traverse the gorge near Grand Canyon National Park in Arizona. Before that, he made a record journey across Niagara Falls in 2012.

Peril also runs in the Wallenda family. Great-grandfather Karl Wallenda was killed at 73 while attempting to walk between two buildings in Puerto Rico in 1978.