The site was discovered by two cave explorers in 1974 in the southern Arizona town of Benson.

INSIDE: Photographs from inside the caverns

From rooms at 50% off to $100 gift cards, local resorts are offering incredible deals. Watch Video

Experts say there's no reason to wait on a better deal to come along because it likely won’t. Watch Video

With added baggage fees and bundles of holiday gifts in tow, efficient packing is a must. Watch Video

"People are doing their own things in the baggage area. It's probably a piece of cake to steal a bag." Watch Video

Get into the spirit of Halloween by staying in a haunted hotel!

What to do with all this stuff you've had collected over the years?

The sale applies to every city where the airline has a presence.

INSIDE: See where you can go from Phoenix

The report says "all but a few" of the MVD offices would be closed, and all rest area operations would be suspended. Watch Video

The FAA is requiring seats stay in place under severe conditions so that passengers have a better chance of surviving. Watch Video