Cave of the Mounds

State: Wisconsin. Type: show cave (natural landmark) near Blue Mounds, Dane County, about 20 miles west of Madison. Accidentally discovered by quarry workers on August 4, 1939; reopened to the public in May 1940. Designated a National Natural Landmark by the U.S. Department of the Interior/National Park Service in 1987.

Cave of the Mounds is a show cave on the southern slope of the eastern of the two Blue Mounds, limestone hills that give the nearby village its name. The cave was found by accident in August 1939 when quarry workers set off explosives that broke through into an unknown cavern, and after safety improvements it opened to visitors the following year. Its limestone dates to the Ordovician Period, roughly 488 million years ago, formed from the accumulated shells of ancient marine organisms, while the cave itself was carved out much more recently, over the last one to 1.5 million years, by acidic rainwater dissolving cracks in the rock. Inside, concrete walkways and theatrical lighting lead visitors past an unusually wide range of formations, including stalactites, stalagmites, flowstone, soda straws, helictites and rare cave-pearl "oolites," colored in reds, browns, blues and grays by trace iron and manganese. The site's geological diversity earned it National Natural Landmark status in 1987, and it remains one of the Midwest's most visited show caves, offering standard lit tours as well as specialty blacklight and lantern tours.

The cave is located at 2975 Cave of the Mounds Road, Blue Mounds, Dane County, Wisconsin, about 20 miles west of Madison, on the southern slope of the eastern Blue Mounds hill.

The cave interior maintains a constant, cool temperature year-round typical of limestone caves, making it a comfortable visit regardless of outdoor conditions. Outdoor conditions at Blue Mounds follow southern Wisconsin's four-season climate, with cold winters and warm, humid summers; a light jacket is worth carrying for the cave's cooler underground air even in summer.

The cave is open year-round, so it can be visited in any season without weather concerns since the tour itself is entirely indoors underground. Summer (Memorial Day through Labor Day) offers extended operating hours and the widest range of specialty tours, while visiting outside peak summer weekends can mean smaller tour groups.

Workers at a limestone quarry on the Blue Mounds hillside accidentally exposed an opening into the cave on August 4, 1939, during blasting operations. Following safety work such as walkways and lighting, the cave reopened to the public in May 1940, and it has since welcomed millions of visitors. In 1987 the U.S. Department of the Interior and National Park Service designated it a National Natural Landmark, citing it as one of the best examples of a natural region's characteristic geologic features. The underlying limestone itself is far older, having formed roughly 488 million years ago in the Ordovician Period, while the cave's void spaces and formations developed much more recently, over the past one to 1.5 million years.

The standard daily cave tour, lasting roughly 45 minutes to an hour, takes visitors through the fully lit cave with guide interpretation of the formations and geology. Specialty options include a one-hour Blacklight Tour, which uses only blacklight illumination to reveal different mineral colors, and a one-hour Lantern Tour that recreates the experience of the cave's original 1939 explorers. Above ground, admission also includes access to nature trails and gardens on the property.

Inside the cave, highlights include large rooms up to two stories tall, stalactites, stalagmites, flowstone formations, soda straws, helictites, curtain formations, and rare cave-pearl oolites, counted among the oldest cave formations in the Midwest. Above ground, the property's nature trails and gardens are included with cave admission.

Cave of the Mounds sits about 20 miles west of Madison, Wisconsin, and is reached by car; there is no rail or transit service directly to the site. Visitors typically drive from Madison or fly into Dane County Regional Airport in Madison and then rent a car or drive from there.

As of research, the cave was open seven days a week, 9 a.m. to 5 p.m., extending to 9 a.m.-7 p.m. during summer (Memorial Day through Labor Day); it is closed on Thanksgiving, Christmas Eve and Christmas Day. Tours start at 10 a.m., with the last tour entering at 4 p.m. (6 p.m. during summer hours). Confirm current hours on the official site before visiting.

As of research, standard admission was $26.99 for ages 13 and up and $16.99 for children ages 4-12, with children 3 and under free; admission includes the guided cave tour plus access to the hiking trails and gardens. Specialty tours (Blacklight, Lantern) may be priced or scheduled separately; confirm current pricing on caveofthemounds.com before visiting.

The standard tour runs 45 minutes to an hour; with time for the above-ground nature trails and gardens, budget one and a half to two hours for a full visit.

The cave sits near the village of Blue Mounds and within a short drive of Mount Horeb and Madison, all of which offer a mix of small-town inns, chain hotels and B&Bs; Madison, about 20 miles away, has the widest range of hotel options for an overnight stay in the area.

Casual dining options are available in the nearby villages of Blue Mounds and Mount Horeb, with a broader range of restaurants available in Madison, about 20 miles east. Specific restaurant names were not verified against an operator or tourism source for this report.

Blue Mounds State Park, with hiking and biking trails on the western Blue Mounds hill, sits nearby and makes a natural pairing with a cave visit. The village of Mount Horeb, known for its Scandinavian heritage and shops, is a short drive away, as is Madison itself with its own museums and attractions.

Dane County Regional Airport in Madison, roughly 20 miles away, is the nearest airport with commercial service. A car is the practical way to reach the site, since there is no direct rail or bus service to Blue Mounds.

Cave walkways are paved but can be uneven or slightly damp in places, so wear sturdy, closed-toe shoes. The cave interior is cooler than outside temperatures, so bring a light jacket even in summer. Lantern and blacklight tours involve reduced lighting, so follow guide instructions closely on uneven terrain. For any emergency, dial 911.

A light jacket for the cool cave interior, closed-toe walking shoes for the paved but sometimes damp walkways, and a camera for the formations are all worth bringing. Cash or card for admission and any gift shop purchases is useful, as is sun protection if you plan to use the outdoor nature trails.

Arrive close to the first 10 a.m. tour if you want the smallest groups, especially during peak summer weekends. Consider a Blacklight or Lantern tour if you've done the standard tour before, since these show the formations very differently. Pair a visit with nearby Blue Mounds State Park or Mount Horeb to make a fuller day out of the trip. Check current hours and prices on the official website before visiting, since schedules and rates are updated seasonally.

Dial 911 for any emergency. For visitor questions, Cave of the Mounds can be reached at 608-437-3038, per its official site.

Cave of the Mounds - https://www.caveofthemounds.com

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This section is being updated and will be available shortly.

This section is being updated and will be available shortly.