If eating a meal 750 feet below the earth appeals to you, you're not going to find a better place to do it than the Underground Lunchroom of the Carlsbad Caverns. This might seem like a strange place to put a restaurant, but it makes perfect sense when you consider that Carlsbad Caverns National Park is visited by over 350,000 people per year. That's a lot of hungry explorers, and I doubt the Guadalupe Mountains of New Mexico are teeming with other food options.
Today, you can pick up a sandwich or hot beverage in the Underground Lunchroom. When it opened in the 1950s, the restaurant had a more extensive menu. Unfortunately, any kind of cooking in the cavern was put on hold until someone discovered a way to prepare a meal without upsetting the cavern's delicate ecosystem.
The Carlsbad Caverns Underground Lunchroom in the 1950s.