Help with English (The most visited national park…)?

The most visited national park in the U.S., Great Smoky Mountains National Park encompasses some 800 square miles of protected forest along the border of North Carolina and Tennessee. At the heart of it all is Gatlinburg, an ideal home base from which to explore the park’s hundreds of hiking trails, go river rafting, fishing, horseback riding, wildlife viewing or embark on numerous other outdoor adventures.
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Question: At the heart of it all is Gatlinburg<< I do not understand this part. Can you explain in other words??

Gatlinburg is a town just North of the park, and near its center. “at the heart” means “at the center”.