[Answer] We found some exciting off-the-beaten-path adventures at popular national parks. Which one has a mile-long lighted trail hike 750 feet underground through fantastical formations that look straight out of Lord of the Rings?

Step 1 : Introduction to the question "We found some exciting off-the-beaten-path adventures at popular national parks. Which one has a mile-long lighted trail hike 750 feet underground through fantastical formations that look straight out of Lord of the Rings?"

...1. San Juan National Historic Site 2. Bryce Canyon National Park 3. Carlsbad Caverns National Park 4. Great Smoky Mountains National Park

Step 2 : Answer to the question "We found some exciting off-the-beaten-path adventures at popular national parks. Which one has a mile-long lighted trail hike 750 feet underground through fantastical formations that look straight out of Lord of the Rings?"

Carlsbad Caverns National Park.,:

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