The Natural Bridge Caverns are the largest known
commercial caverns in the U.S. state of Texas.
The caverns are located near the city of San Antonio, Texas.
I have seen these caverns in 2010
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Dr. Vijay Pithadia, FIETE, PhD, MBA Director, PhD Guided: 5, Author of 6 Books, Google Scholar Citations - 635, h-index - 8, i10-index-8, M: +91 9898422655 UGC/Scopus/Web of Science Publication: 31, Referred Publication: 67, Book Chapters: 12, Full Papers Published in Conference Proceedings: 21, Patent Published: 3, Invited Lectures and Chairmanship etc.: 44, Conference Organized: 4, AICTE faculty ID: 1-24647366683