Colossal Cave, Show cave and museum in southeastern Arizona, United States.
Colossal Cave system contains 3.5 miles of mapped limestone passageways with stalactites, stalagmites, and unusual rock formations throughout its chambers.
Indigenous groups including Hohokam, Sobaipuri, and Apache Indians utilized the cave system between 900 and 1450 AD for shelter and ceremonies.
The cave gained notoriety in the 1800s when train robbers allegedly used its passages to hide stolen currency from Southern Pacific Express heists.
The cave maintains a constant temperature of 70 degrees Fahrenheit year-round, with guided tours operating daily from 10 AM to 3 PM.
Scientists estimate the cave system extends for 39 miles, yet only two miles of passageways have been fully mapped after two years of exploration.
Location: Pima County
GPS coordinates: 32.06500,-110.63100
Latest update: May 14, 2025 09:35
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