Discovering Kaklık Underground City – The Subterranean Pamukkale of Denizli

Tucked just 30 km east of Denizli and a short drive from the celebrated terraces of Pamukkale lies a geological marvel largely overlooked by tourists: Kaklık Cave—a dazzling “underground Pamukkale” hidden beneath a collapsed sinkhole. Opened to visitors in the early 2000s, this natural wonder reveals a subterranean realm of shimmering travertine formations, turquoise pools, and verdant cave walls.

1. Origins and Geological Wonders

Kaklık Cave, also dubbed “Little Pamukkale”, formed when an underground thermal stream eroded Mesozoic‑era limestone, marl, and travertine, eventually collapsing to expose its interior to the world . Measuring around 190 meters in length with internal depths up to 14 meters, the cave houses a circular entrance 13 meters wide, allowing daylight to filter in and nourish moss and ivy clinging to its walls .

Dripping mineral-rich waters continue to deposit calcium carbonate, sculpting delicate stalactites, stalagmites, and travertine terraces—an echo of Pamukkale’s famed landscape. The visual treat within these stone chambers mirrors the grandeur of its surface counterpart .

2. Thermal Waters & Healing Springs

At the heart of the cave lies a captivating thermal pool, its radiant turquoise hue the result of minerals and sunlight interplay . With water hovering around 32 °C and rich in sulfur and alkalinity, these waters are believed to soothe skin and respiratory ailments—a natural spa nestled within rock .

Covering chemistry measurements from local authorities, the cave’s pH of 6.85, calcium of ~286 mg/L, and magnesium around ~110 mg/L underscore the therapeutic potential of its mineral springs . Adjacent outdoor pools offer visitors the chance for a casual, free mineral bath in shaded, kiosk‑lined surrounds .

3. Botanical and Faunal Life

Basking in cavern light pouring through the collapse, the cave walls are adorned with lush mosses, ivies, and algae, painting the interior in enchanting greens alongside the gleaming white travertine . This mini ecosystem supports cave-dwelling insects and bats, lending a breath of life to the stone chambers .

4. Illumination & Visitor Pathways

Wooden walkways snake through the cave, guiding visitors past narrow waterways and holding areas where footing can be wet. The cave’s dimensions (about 2–5 m high ceilings) and stone stairs warrant careful navigation in sturdy, non-slip footwear . Artificial lighting has been artfully installed to illuminate features without disturbing the ecosystem .

5. Visitor Experience & Amenities

Since opening in 2002, Kaklık Cave has been equipped for tourism comfort: illuminated trails, clearly marked staircases, viewing platforms, and a small amphitheater near its entrance . A nearby café and kiosk area offers refreshments, while the outdoor thermal pool invites leisure dips .

Inside those stone corridors lies a postcard-perfect sight: turquoise rivulets rippling through travertine steps, sunlight spotlighting mossy walls, and soft echoes dancing in the air—a serene 15–30 minute loop that often entrances visitors for much longer .

6. Practical Info: Timings, Fees & Access

7. Adventure Recommendations

• Combine with Pamukkale: Less than an hour away, Kaklık Cave provides a subterranean counterpoint to the iconic terraces .

• Dips & Relaxation: Take advantage of the outdoor mineral pool and kiosk area for a peaceful break.

• Photography Tips: Early morning light creates magical contrasts between green cave walls, white travertines, and mineral pools.

• Nearby Explorations: Consider pairing your visit with stops at Karahayıt thermal springs or Mount Honaz National Park .

8. Why Kaklık Cave Stands Apart

Travelers consistently report that Kaklık offers something unique—a lesser-known natural spectacle that rivals its famous neighbor while feeling more intimate. One visitor on Reddit shared:

“Kaklik caves… has the same travertine formations of Pamukkale, but underground in a cave… I was the only person there besides a security guard during my hour visit.”

Its blend of geological history, thermal therapy, lush plant life, and immersive walkways makes it a perfect stop for explorers chasing hidden natural beauty.

9. Practical Tips for a Seamless Visit

1. Early or Late Visit: Beat peak hours by arriving early or in the evening.

2. Foot-Friendly Preparations: Go barefoot or bring flip‑flops for wet surfaces.

3. Watch Your Valuables: Leave valuables in the car or hotel; sulfur water may damage jewelry.

4. Health Note: Ventilation is generally good, but those with respiratory issues may wish to take care.

5. Combine Experiences: Visit Karahayıt or Pamukkale in the same day to maximize your Denizli adventure.

10. Final Thoughts

Kaklık Underground City is more than a geological curiosity—it’s a serene, almost secret world where daylight meets mineral waters, stone meets moss, and time seems to stand still. With fewer crowds than its famous neighbor, it offers a meditative, immersive experience: 190 meters of ambience, adventure, and wonder. Whether as part of a Pamukkale tour or as a standalone adventure, Kaklık promises memories etched in stone, sunlight, and shimmering springs.

If you plan to visit Denizli, be sure to carve out time for this subterranean gem. Between its healing waters, photogenic travertines, and tranquil atmosphere, Kaklık Cave is a perfect place to explore the depths—literally and metaphorically—of Turkey’s natural heritage.

Enjoy your journey, and may Kaklık’s underground beauty surprise and inspire your travels!