George ‘The Human Fly’ Willig, a 28-year-old mountain climber and toymaker from Queens, New York, took New York City by storm when he scaled all 110 floors of the World Trade Center’s South Tower. It’s a feat that hasn’t been successfully completed since. At the time of Willig's climb, the South Tower was the third-tallest building in the world, right behind the North Tower and the Sears Tower. Willig was immediately arrested upon returning to the ground. He was booked for criminal trespass and other charges. Willig began his journey at 6:29 a.m., with his brother Stephen P. Willig, 22, and friend Gerald R. Hewitt, 28, with him. They remained on the ground. Three-and-a-half hours later, Willig makes it to the tower's top.

Willig, seen here resting next to a scaffold containing Port Authority patrolman Glenn Kildare and police officer Dewitt Allen, had been planning the trek for over a year. He had also designed special equipment, including one that would allow him to properly grab hold of the building's grooves, to aid him in his journey.

Police barriers hold back part of the crowd of thousands

With girlfriend Randy Zeidberg&nbsp;

High-wire artist Philippe Petit, who walked a tightrope between the Twin Towers in August 1974, dines at Windows on the World with George Willig, the day after Willig scaled the South Tower of the World Trade Center.

The Human Fly who scaled the WTC