This large cave in Iron Mountain above Glenwood Springs contains about three miles of known passageways and was first opened as a tourist attraction at the beginning of the twentieth century; it was abandoned in the 1920s, then reopened in 1999. A family tour along electrically lit gravel pathways is available through some fantastic interior decorations that Martha never even dreamed of. The caves open May 1.


Another tourist cave that had been abandoned for years, Manitou offers a physically challenging wild tour that includes sections discovered as recently as five years ago. Still missing is a large section that was open to tourists, complete with electric lights and hand-rails, until it flooded in the 1920s. Check out the Web site, www.caveofthewinds.com, for an in-depth probe.


At 7,000 feet, Spring Cave, which opens May 1, is one of the longest caves in Colorado, located less than a mile from the South Fork Trailhead, east of Meeker. In springtime, the stream that flows through the cave widens to form "Emerald Lake," which makes a full wetsuit a requirement for anyone heading into the back sections.

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