The caverns were discovered in 1960 by four students from St. Mary's University in San Antonio.
The cave system remains geologically active, with mineral-laden water continuing to build formations.
The 'Watchtower' is one of the tallest formations in the cavern, standing over 50 feet high.
The cave system features a unique 'dome pit' formation created by centuries of water erosion.
The site spans a significant portion of the Edwards Aquifer recharge zone.
The limestone rock dates back to the Cretaceous period, approximately 100 million years ago.
Natural Bridge Caverns is a karst limestone cave system located near San Antonio, Texas, featuring expansive subterranean chambers and geological formations. It is home to the Discovery Tour, which traverses rooms with stalactites, stalagmites, and flowstones, and the Hidden Wonders tour, a more physically demanding exploration. Above ground, the site includes a canopy challenge course, zip lines, and a ropes course. The site is named after the 60-foot limestone bridge spanning the amphitheater-like cave entrance. The caverns maintain a constant ambient temperature of 70 degrees Fahrenheit regardless of external weather conditions. It is a commercially operated site that functions as both a natural park and an adventure center.
The entrance area, where the 60-foot natural limestone bridge frames the mouth of the cavern.
Book tour reservations online in advance, as guided spots frequently sell out during weekends and summer months.
Wear rubber-soled, closed-toe shoes with good traction, as cave paths can be slippery and uneven.
Arrive at least 30 minutes before your scheduled tour to account for parking and shuttle travel to the cavern entrance.
Do not wait until the day of your visit to purchase tickets, as walk-ins are often accommodated only if space permits.
Open daily year-round, except for Thanksgiving and Christmas Day.
Touching formations is strictly prohibited to preserve delicate mineral oils and growth; flash photography is permitted, but tripods are generally restricted.
