Sound the coal mine whistle and fire up the Tesla coil, because the Griffin Museum of Science and Industry celebrated a major milestone Wednesday.

The museum, at 57th and DuSable Lake Shore drives, welcomed its 200 millionth visitor.

That visitor was Ray Garcia, along with his granddaughter, Riley Cruz 

Riley and her grandfather received "Golden Ticket" — a lifetime membership to the museum. 

When Garcia walked through the museum doors with his granddaughter on Wednesday, he had no idea he'd be the recipient of such an honor.

"I just walked in, parked, went to the membership line, showed them my car, and they told me I'm the 200 millionth visitor. I go, 'Oh, no way!' " said Garcia. "I never thought I'd be the one. I come here with my granddaughter every month since she was in a stroller, and she'll be 3 years old next week."

Garcia said he will continue using his lifetime membership with his granddaughter.

The museum also hosted hands-on bubble science activities on its front lawn for all of their guests Wednesday, including an attempt to blow 200 million bubbles.

Garcia and his granddaughter were invited to join a dry ice bubble show and participate in the bubble-blowing attempt.

The Museum of Science and Industry first opened in 1933, and is now the largest science museum in the Western Hemisphere.