Located 10 miles outside of Payson, Arizona, the Tonto Natural Bridge is believed to be the largest natural travertine bridge in the world.

And while walking over a natural bridge may sound cool, it's really the adventure through the tunnel underneath that is worth the drive.

The bridge is immense, standing 183 feet high with a 400-foot tunnel running underneath it.

A couple weeks ago, I made the drive out of the Valley to explore this Arizona landmark.

The tunnel and falling water provided a welcome reprieve for this former Seattle resident turned desert dweller.

Visitors should come prepared for a little hiking and some slippery rocks. Water falls from the bridge down to the tunnel below, which also holds a series of pools, so it can be slick in places.

The state park that houses the bridge has a number of trails and viewpoints for people to explore. Those not up for scrambling through the tunnel can take an easy walk to see the bridge from above, or take a trail to a platform view of the bridge.

The Tonto Natural Bridge State Park is open from 9 a.m. to 5 p.m. every day of the week, and there is a entry fee. Visitors should leave their four-legged friends at home -- pets are not allowed.

PHOTOS: Tonto Natural Bridge