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The title of the deepest cave in Arizona and the largest dry cavern in the United States goes to Grand Canyon Caverns.
It is one of the more exciting caves in AZ because you have to take an elevator down to explore it. Once you're at the bottom, there are a number of different walking tours available and even a hotel inside the cave, though it's not easy to book a room.
There are plenty of amenities and shops on-site as well. No matter what walking tour you take, this is an enormous cave system, and you can literally spend hours within, exploring every last nook and cranny.
Food ( Breakfast & Dinner)