Frank Kotnik grew up watching the Twin Towers rise across the river. As a teenager, he and his friends once snuck into the original World Trade Center, making it almost to the top before being discovered by a security guard.

The Twin Towers eventually collapsed in a cloud of toxic dust, leaving a lasting health impact that has endured for decades. Kotnik, who worked as a blacksmith for the New York City Department of Transportation, visited Ground Zero on September 13, 2001, after working a 12-hour shift.

Further details about Kotnik's experiences and the aftermath of the Twin Towers' collapse are available from the source.