Entry No. 163 — the Denver file — filed under: walk-in vault
Underhill Museum
The Underhill Museum preserves the Victorian home and office of Dr. James Underhill — a mining engineer and U.S. Deputy Mineral Surveyor — exactly as it was when he and his wife Lucy lived there from 1912 to 1963, complete with his collection of rocks, minerals, historic photos, and a bank-style vault you can step inside. Run by the Idaho Springs Historical Society on a $2 suggested donation, it's one of the most genuinely quirky and personal small museums along I-70.
The story
When Dr. James Underhill—a Harvard-educated geologist, Colorado School of Mines professor, and U.S. Deputy Mineral Surveyor—built his home on Miner Street in 1912, he took steps to keep his work from bleeding into his personal life. He and his wife, Lucy, acquired a lot that had served as the livery yard for the hotel next door and constructed a house with twin front doors. The east door guided miners and land investors straight into James's engineering office; the west door led social callers down a quiet hallway into Lucy's living quarters so client meetings wouldn't interrupt domestic life.
Inside, the building remains preserved just as the couple inhabited it through 1963. Behind the office desks stands a bank-style walk-in vault where Underhill locked away official mine claim maps, survey records, and his personal hoard of mineral specimens. Out back, Lucy turned the property's former livery history to her advantage, using the nitrogen-rich soil to grow delphiniums that reputedly reached twelve feet tall beside a courtyard fountain.
Before her death, Lucy willed the property to the community with a sharp legal codicil: the house could never, under any circumstances, be converted into a bar or tavern. Today, the Idaho Springs Historical Society maintains the residence on a $2 suggested donation, letting you step inside the vault, examine early 20th-century surveying equipment, and walk through a piece of town history that legally escaped the commercial drinking joints down the street.
What it's like
You will find the museum right along the walkable stretch of Miner Street, marked by its twin front entrances. Inside, the vibe is low-key, dusty, and volunteer-run, with docents who let you wander through the living quarters and step directly inside the steel walk-in vault at your own pace. Because it operates on a small budget and volunteer shifts, hours are seasonal and occasionally unpredictable; confirm they are open before making the drive up I-70, and bring cash for the donation box.
The move: Spend an hour wandering the preserved rooms of the Underhill house — peeking into the twin front doors (one for business, one for social calls), handling the mineral specimens, and ducking into the walk-in vault — then stroll the restored Victorian garden out back before grabbing a meal on Miner Street.
📍 Before you go You'll find it right on Miner Street, the walkable historic main drag in downtown Idaho Springs, an easy half-hour drive west of Denver just off I-70 — pair it with lunch, a brewery, or candy-shop browsing along the same few blocks. The two front doors aren't decoration: the east one led into Dr. Underhill's office, the west into the family's social rooms. Don't skip the restored rear garden and fountain. As a tiny, donation-run historical-society house, it keeps limited and often seasonal hours at a relaxed, volunteer-staffed pace, so confirm ahead before making the drive and carry a little cash for the donation box.
- 📍 Idaho Springs
- 💸 $
- ⚡ Up for anything
- 🌗 Indoors
Where: 1414 Miner St, Idaho Springs, CO 80452
Hours: Mined 2026-06-07 — confirm current hours before you go.
Pair it with
- Edgar Experimental Mine — Dr. Underhill served as the director of this actual working research mine, making it the direct field site for the survey maps and mineral samples stored back in his house vault.
- Indian Hot Springs Geothermal Caves — After browsing dry paper archives and mineral drawers, walk three blocks south to soak in geothermal mineral cave pools carved into the rock.
- Charlie Tayler Water Wheel — Head two blocks down Miner Street to see a 30-foot wooden waterwheel built in 1893 by a local miner who famously refused to bathe.
- The Face on the Barroom Floor — A short drive over the ridge brings you to Central City, where you can order a drink above a famous floor portrait—something Lucy Underhill legally banned in her own home.
Good to know
Why does the house have two front doors side-by-side?
The east door opened directly into Dr. Underhill's mineral survey office for clients, while the west door served as the private entrance for Lucy's social visitors.
What is inside the walk-in vault?
Dr. Underhill used the bank-style vault to store valuable survey notes, mining claim documentation, maps, and his collection of rock and mineral samples.
How much does admission cost?
Entry is managed on a $2 suggested donation, which goes directly to the Idaho Springs Historical Society for building maintenance.
What is the legal restriction on the property?
When Lucy Underhill willed the home for public use, she included an explicit legal condition stating the property could never be used as a tavern or bar.
Plan a visit & invite your people →
Further reading: historicidahosprings.com · colorado.com · thisisidahosprings.com
last checked: 2026-06-07