It's called the Singing Road. Follow Route 66 west of Tijeras, New Mexico. Slow down to 45 miles per hour and drive over the rumble strip on the side of the road. The bumps are arranged so that they will vibrate your car's tires to the tune of "America the Beautiful."
The National Geographic Channel and the New Mexico Department of Transportation created the Singing Road in 2014 to serve as a roadside attraction, as well as persuade drivers to avoid speeding. ABC News (auto-start video) reported at the time:
The Singing Road was constructed by Sand Bar Construction on old Route 66, just west of Tijeras and east of Albuquerque. A mathematician from Tigress Productions created the attraction for the National Geographic Channel series.
"They started work on Monday and finished on Tuesday," Dosher said. "It's remarkable the speed in which they finished it."
This video from the National Geographic Channel explains how they built the Singing Road. It's a remarkably precise work of engineering.