Inside a Utah limestone cliff, 42 formations and one very unlikely heart

The caves that almost got stripped bare

About 40 miles south of Salt Lake City, a narrow limestone canyon holds three caves that almost didn’t survive long enough for anyone to protect them.

A mining company got there first, and what happened next shaped everything about this place. Timpanogos Cave National Monument sits high on the cliffs of American Fork Canyon, and to reach it, you hike.

The caves have been waiting at the top since long before anyone thought to look.

Cougar tracks led a logger to the first cave

It started with snow and a set of prints. In October 1887, Martin Hansen was cutting timber in American Fork Canyon when he spotted cougar tracks and followed them up the canyon wall.

The tracks led to an opening in the rock. Hansen had found a cave, and he started charging people to see it.

That didn’t stop a Chicago onyx company from coming through in the 1890s and stripping most of Hansen Cave’s mineral formations before anyone could intervene.

Two teenagers and a lost entrance changed everything

In 1913, two teenagers named James Gough and Frank Johnson found a second cave near Hansen Cave while poking around the canyon. Then the entrance got lost again.

It wasn’t until Aug. 14, 1921, that Vearl Manwill rediscovered it.

That same October, Hansen’s son and grandson turned up a third cave, Middle Cave, sitting right between the other two.

A year later, President Warren G. Harding made it official, designating the site a national monument on Oct. 14, 1922, to protect the caves for their “unusual scientific interest.”

The 1.5-mile trail that earns you the cave

There’s no easy way in. The cave entrance sits high on the canyon wall, and the only way there is a paved trail that climbs nearly 1,100 feet over 1.5 miles. Most people take about 90 minutes going up.

The trail follows the steep south side of American Fork Canyon, with views that open up across the canyon floor and the surrounding Wasatch peaks.

Signs along the way cover local plants, animals, and geology, so there’s enough to look at to keep your mind off your legs.

42 types of formations packed into three caves

Most caves have a handful of formation types. This one has 42.

The caves connect through artificial tunnels blasted in the 1930s, and the one-way tour through all three opened in 1939. What you find inside is the reason the National Park Service singles this place out.

Helictites twist in every direction, thin as hand-blown glass and no wider than a quarter inch, defying the logic of how formations are supposed to grow.

Anthodites, needle crystals that branch like flowers, crowd the walls in quantities the NPS says exist in no other developed cave it manages.

The colors underground that no one expects

Most people expect white. What they get here is something else.

The formations run yellow, green and purple because of the minerals riding along in the dripping water. Nickel brings the yellows and greens.

Manganese pulls the purple out of the rock. Mixed in with the helictites and anthodites, you’ll also find stalactites, stalagmites, flowstone, cave popcorn and formations called cave bacon and draperies.

The variety isn’t something you’d guess from the outside.

The Great Heart of Timpanogos waits near Hidden Lake

Deep inside Timpanogos Cave, the tour passes a pool called Hidden Lake, and just beyond it hangs the formation that locals have been talking about for generations.

The Great Heart of Timpanogos is a large stalactite shaped exactly as the name says.

It inspired legends long before the monument existed, and seeing it in person, lit from below in the cool cave air, is a different thing than reading about it.

What the guided tour actually looks like

Rangers lead groups of 16 through all three caves, and the tour inside runs about 55 minutes. The full experience, counting the hike up and back down, takes around 3.5 hours.

The path through the caves is paved and lit, with stairs in several spots. Bring a jacket.

The temperature inside holds steady at about 45 degrees Fahrenheit year-round, and that’s cold enough to notice when you’ve been sweating on the trail.

Crawl through Hansen Cave the way Hansen did

If you want more than a paved walkthrough, the Introduction to Caving tour takes you into Hansen Cave without the developed path.

You wear a helmet and headlamp and follow the same route Martin Hansen used in the 1800s, which means scrambling and sometimes crawling through natural passages.

The tour runs about 90 minutes inside, fits five people, and requires you to be at least 14 and in solid physical shape.

One hard rule: no clothing or gear that’s been in any other cave, because the monument takes seriously the risk of spreading White Nose Syndrome to its bats.

The first urban dark sky place in the National Park Service

In September 2020, the monument became the first National Park Service unit certified as an Urban Night Sky Place by the International Dark-Sky Association.

That’s a significant designation for a park sitting 40 miles from Salt Lake City, and it recognizes what the canyon does naturally: block enough light pollution to give visitors a real night sky.

Summer programs through the park and local astronomy groups bring that overhead experience down to earth. Utah has more certified International Dark Sky Places than any other state.

Drive the Alpine Loop for the full canyon picture

The monument sits along the Alpine Loop Scenic Byway, a 20-mile paved drive through the Wasatch Range that follows Utah Highway 92 up American Fork Canyon and connects into Provo Canyon.

Along the way, you’ll pass Mount Timpanogos, the second-highest peak in the range at 11,750 feet. Fall is when the drive gets crowded, with maples and aspens going red and orange across the canyon walls.

A short detour off the byway leads to Cascade Springs, a natural mountain spring with a quarter-mile boardwalk over clear pools.

Fish, picnic and explore at the canyon floor

Before or after the hike, the canyon floor gives you plenty of room to settle in. The monument has two picnic areas along American Fork Creek near the visitor center, shaded by trees.

A quarter-mile nature trail offers a flat walk if the cave trail is too much for the day.

Inside the visitor center, exhibits cover the caves, local wildlife and geology, plus a mini cave display built for kids.

American Fork River, running at the base of the canyon, supports trout fishing with a valid Utah license.

Visit Timpanogos Cave National Monument in Utah

You’ll find the monument in American Fork Canyon off Highway 92, about 10 miles east of Interstate 15 at Exit 284. In 2026, daily cave tours run from May 18 through Oct. 5, and advance tickets are strongly recommended.

You can buy them up to 30 days ahead through the Recreation. gov reservation system.

Bring at least one liter of water per person for the trail, and pack a light jacket for the cave. Strollers and wagons aren’t allowed on the cave trail, but wheelchairs are permitted as essential mobility aids.

The visitor center, picnic areas and restrooms are accessible at the base.

This article was created with AI assistance and human editing.

Read more from this brand:

• Southern Utah’s biggest forest is larger than Zion, Bryce, and Capitol Reef combined
• Why serious hikers skip Zion and head straight to Snow Canyon instead
• You don’t have to hike to see three states from this southern Utah summit at 11,312 feet