The wildest thing in Gainesville is a 500-foot sinkhole with a rainforest at the bottom

It’s inside Florida’s wildest sinkhole

A few minutes from downtown Gainesville, a hole in the ground drops 120 feet through ancient rock and holds a miniature rainforest at the bottom.

Devil’s Millhopper Geological State Park covers about 67 acres on the city’s northwest side, and the sinkhole at its center stretches roughly 500 feet across.

You walk down 132 steps on a boardwalk staircase, and by the time you reach the bottom, the sunny Florida afternoon above you is gone.

Ferns, trickling water and moss-covered limestone have replaced it, and the air feels like a different state entirely.

Millions of years of rock tell the story

Acidic groundwater spent thousands of years eating through the limestone underground, carving out huge cavities beneath the surface. At some point, the roof gave way and left the massive bowl you see today.

Look at the exposed walls on your way down and you can read two chapters of deep time. The Hawthorn Group sediments go back roughly 5 to 23 million years, to the Miocene Epoch.

Below that sits the Ocala Limestone, more than 34 million years old.

The devil, a hopper and a kidnapped woman

Early settlers looked at the sinkhole’s funnel shape and saw a hopper, the cone-shaped device that feeds grain into a gristmill.

When bones and fossils turned up at the bottom, locals decided the devil had something to do with it.

One legend says he kidnapped a Native American woman and punched the sinkhole into the earth to stop anyone from saving her.

Geology tells the real story, of course, but the name Devil’s Millhopper stuck and nobody tried to change it.

132 steps down on a rebuilt boardwalk

Hurricane Irma tore up the original staircase in 2017, and the park had to replace the entire boardwalk.

The new one reopened in June 2019 with 132 steps, though the old version had more than 230 and reached deeper into the pit.

Multiple landings break up the descent, so you can stop, catch your breath and watch the scenery shift at each level. The ferns get thicker, the light gets dimmer and the air changes the farther down you go.

The air cools fast on the way down

That depth and all that shade create a microclimate inside the sinkhole that runs noticeably cooler and more humid than the surface.

In summer, the difference between the rim and the bottom hits you like walking into a root cellar.

The cool, wet conditions support plant species that normally grow in Appalachian Mountain ravine systems, not in central Florida. One minute you are standing in a sunny afternoon.

A few dozen steps later, you are in a pocket of mountain forest.

Appalachian ferns cling to the limestone walls

Ferns, mosses, liverworts and orchids cover the damp rock on all sides. Needle palms and live oaks line the slopes above them.

Some of the species here have no business growing in Florida.

Green dragon, cutleaf spleenwort, jack-in-the-pulpit and lanceleaf wakerobin, a trillium near the southern edge of its range, all thrive on these walls.

Moisture from the springs and streams inside the sinkhole keeps the greenery going year-round, even through Florida’s dry spells.

Twelve springs feed a pond at the bottom

You hear the water before you see much of it. Dripping and trickling sounds follow you down the staircase from the first landing.

Twelve springs, some easier to spot than others, feed a pond sitting at the floor of the sinkhole. Small streams run down the steep limestone walls and slip into crevices in the rock.

After a good rain, those trickles pick up and turn into gentle cascading waterfalls along the walls, and the whole bowl fills with sound.

Shark teeth from an ancient shallow sea

Researchers have pulled fossil shark teeth, marine shells and the remains of extinct land animals out of the sinkhole over the years.

Those finds tell you that this part of Florida once sat under a warm, shallow sea millions of years ago. Visitors have also turned up prehistoric arrowheads, though nobody recorded exactly where those came from.

The exposed rock layers work like a visible timeline, stacking Florida’s natural history in plain sight from top to bottom.

Three ecosystems packed into 67 acres

For a small park, Devil’s Millhopper holds a lot of ground.

Differences in water, sunlight, soils and fire divide the acreage into distinct natural communities. Sandy soil and pine trees mark the sandhill areas, where regular fires keep things in check.

The hammock zones sit on moist soil and grow thick with broadleaf trees and low plants. Swamp areas stay wet year-round.

A few catface pines still stand in the park, scarred reminders of Florida’s old turpentine industry.

Walk the rim trail and spot 30 warbler species

A half-mile nature trail follows the top of the sinkhole through shaded hardwood hammock, with views straight down into the pit. The trail currently runs as an out-and-back route because of a bridge closure.

The park sits on the Great Florida Birding Trail, and the list of species here runs long. Wood Thrush, Pileated Woodpecker, Summer Tanager and Eastern Screech-Owl all show up.

During migration, as many as 30 species of wood-warblers pass through. Keep your eyes low, too, for box turtles, tree frogs and salamanders.

The CCC built the limestone gate in the 1930s

During the Great Depression, the Civilian Conservation Corps reportedly built a stairway and a limestone entrance gate at the site. You can still see that CCC-era gateway when you pull in.

The University of Florida owned the property for a while and used it for research, but student gatherings brought litter and erosion. The state bought it in 1974 and finished the first public staircase two years later.

Inside the visitor center, interpretive exhibits and a short film walk you through the sinkhole’s formation and history.

Guided walks start Saturday mornings at 10

The park sits just off Millhopper Road, only a few minutes from downtown Gainesville.

Rangers lead guided walks on Saturdays at 10 a.m., and you can book group tours by reservation if you are bringing a crowd.

Leashed pets can join you on the nature trail, in the picnic areas and down to the sinkhole, as long as they stay on a six-foot hand-held leash.

Picnic tables and restrooms sit near the parking area, so you can make a morning of it.

Visit Devil’s Millhopper in Gainesville, Florida

If you want to see 34 million years of Florida’s past in a single walk, head to Devil’s Millhopper Geological State Park at 4732 Millhopper Road in Gainesville.

The park opens daily at 8 a.m. and stays open until sundown. Admission runs $4 per vehicle for up to eight people, or $2 if you walk or bike in.

From I-75, take exit 390 east on CR 222, turn left on NW 43rd Street, then left on Millhopper Road. The entrance is on the right.

This article was created with AI assistance and human editing.

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