June

What's the name of this crowded and smoggy national park?

Chartered in 1934 and officially dedicated by FDR six years later, this park straddles the border between Tennessee and North Carolina. Elevations in the park range from a low of 876 feet to a height of 6,643 feet. In fact, 16 mountains within the park exceed 6,000 feet.

Did you know:

-- This is America's most visited national park, averaging more than 9 million visitors a year.

-- It is also considered the most polluted national park, recording approximately 150 unhealthy air days between 1999 and 2003.