Entry No. 24 — the Salt Lake City file — filed under: soak
Salt Cave & Selenite Crystal Cave at Synchronicities
Two side-by-side grottoes built inside a strip-mall suite: a Himalayan halotherapy room lined with roughly 10,000 lbs of pink ionized salt, and next door a second cave encased in about 3,000 lbs of raw selenite crystal that glows under UV light — locals call it "2 caves in 1 place."
The story
From the asphalt of the Union Square shopping center in Sandy, you’d never guess Suite C houses six and a half tons of raw subterranean geology. Step past the retail counter of Synchronicities and you leave suburban Salt Lake County behind for two custom-built indoor grottoes that feel more like sci-fi sets than strip-mall suites.
The first chamber is a Himalayan halotherapy cavern encrusted with roughly 10,000 pounds of pink salt rock, designed for reclining while micro-particles of dry aerosol salt circulate through the air. But the real curveball is next door: a second, smaller chamber encased in roughly 3,000 pounds of raw selenite crystal. When the ambient lights drop and the UV bulbs kick on, the fibrous, translucent gypsum walls glow with a soft, otherworldly ultraviolet luminescence.
Locals know it simply as 'two caves in one place,' but the charm lies in the absurd contrast. You aren't trekking into Big Cottonwood Canyon or hiking down into a desert mine—you're getting a deep, quiet mineral soak right off 9400 South, sandwiched between suburban storefronts.
What it's like
Pull into the Sandy strip mall, step into the shop, and shed your shoes at the door. If you book back-to-back sessions, you'll start with 45 minutes reclined in the pink salt cave breathing dry aerosolized salt, then transfer directly into the quiet selenite chamber under its glowing crystal ceiling. The atmosphere is muted, cool, and distinctly weird. Wear comfortable clothes and clean socks, verify their operating hours before driving out, and don't expect a slick commercial day spa—this is an earnest, fanatically constructed double grotto tucked behind a retail floor.
The move: Book back-to-back sessions — 45 minutes reclining in the salt cave for the lungs, then walk next door and lie inside the selenite cave under its crystal-lit ceiling.
- 📍 Sandy, UT
- 💸 $$
- ⚡ Low-key
- 🌗 Indoor or outdoor
Where: 9419 S Union Square, Suite C, Sandy, UT 84070
Hours: Added 2026-07-20 — confirm current hours before you go.
Pair it with
- The Conjuring Tree — Head 4.6 miles west to West Jordan to browse ritual tools and Renaissance counter goods after your crystal cave soak.
- Cottonwood Paper Mill — Drive five miles northeast to trade Sandy's artificial indoor caves for the massive stone ruins of an 1883 paper mill.
- Crone's Hollow — Follow up your halotherapy session with a 7.5-mile drive north to Salt Lake's long-running pagan community store and sanctuary.
Good to know
What is the difference between the two caves?
The Salt Cave is a halotherapy room lined with roughly 10,000 lbs of pink Himalayan salt for respiratory relaxation, while the Selenite Crystal Cave is built from 3,000 lbs of raw selenite that glows under UV light.
Where is it located?
Inside Synchronicities at 9419 S Union Square, Suite C, Sandy, Utah.
How long are sessions and how should I plan my visit?
A standard session in either cave lasts 45 minutes. Booking back-to-back sessions allows you to experience both chambers in one trip.
What should I wear?
Wear loose, comfortable clothing and bring clean socks, as street footwear is removed before stepping into the cave areas.
Plan a visit & invite your people →
Further reading: saltcaveslc.com · Official site · Tripadvisor · Yelp
last checked: 2026-07-20