Entry No. 16 — the Philadelphia file — filed under: folk art
Fonthill Castle
Archaeologist and tile-maker Henry Mercer hand-poured this 44-room concrete castle himself between 1908 and 1910 - 200-plus windows, all different sizes, 18 fireplaces, and his own decorative tiles embedded in nearly every surface. A horse named Lucy helped hoist the concrete buckets.
The story
Henry Chapman Mercer didn't trust architects, and he certainly didn't trust wood. Between 1908 and 1912, the archaeologist and tile maker decided to build himself a home in Doylestown without blueprints or formal engineering plans. Instead, he drew rough sketches on paper, hired local laborers, and enlisted a horse named Lucy to hoist buckets of wet cement up wooden scaffolding. Mercer poured 44 rooms out of solid concrete from the inside out, embedding his own hand-fired Moravian tiles directly into the ceilings, walls, and archways while the mortar was still wet.
The resulting structure is an unsettling, brilliant labyrinth. Mercer built over 200 windows into the walls, deliberately ensuring no two were identical in size or shape. He scattered 18 fireplaces throughout the house, constructed Vaulted ceilings by piling mounds of dirt on wooden platforms, pressing tiles into the soil face-down, pouring concrete over the mound, and shoveling the dirt out after it dried. His obsession with fireproofing meant almost every surface—from bookcases to stairways—was rendered in cold, unyielding gray stone.
What it's like
You can't just wander this concrete labyrinth unsupervised; entry is by 60-minute guided tour only. Wear sturdy shoes because you'll be navigating narrow winding staircases, uneven hand-poured steps, and low doorways. The concrete structure holds cold weather well into spring, so bring layers even if it feels pleasant outside. Pay attention to the ceilings in the smaller chambers, where you can still see the wood-grain impressions left by the wooden forms Mercer used to set the wet concrete over a century ago.
The move: Take the 60-minute guided tour from tower to crypt, then walk over to the neighboring Moravian Pottery and Tile Works to see the kilns where Mercer's tiles were actually fired.
- 📍 Doylestown, Bucks County
- 💸 Free
- ⚡ Up for anything
- 🌗 Outdoors
Where: 525 E. Court Street, Doylestown, PA 18901
Hours: Added 2026-07-19 — confirm current hours before you go.
⚠ Seasonal or scheduled — always check before you go.
Pair it with
- Mercer Museum — Complete the Henry Mercer concrete double-feature by visiting his six-story tool-stuffed castle just one mile away.
- Southampton Spa — Soothe your legs after climbing Mercer's endless hand-poured concrete stairwells by sweating it out in a authentic Russian banya down the road.
- Ryerss Museum and Library — Trade Mercer's architectural tile obsession for another local eccentric's house packed with Victorian artifacts and taxidermy.
Good to know
Do I need to buy tickets in advance?
Yes. Tour sizes are small due to the tight stairwells and narrow rooms, and guided timeslots routinely sell out in advance.
What are the castle's hours?
Fonthill Castle is open Tuesday through Sunday from 10:00 AM to 5:00 PM, and is closed on Mondays.
Is the castle accessible for wheelchairs or strollers?
No. The interior is full of narrow, uneven concrete staircases, tight passages, and stepped doorways that make wheelchairs and strollers impossible to use inside.
How long should I budget for a visit?
Plan for about 60 minutes for the internal tour, plus an extra hour if you want to walk the grounds or visit the neighboring Moravian Pottery and Tile Works.
Plan a visit & invite your people →
Further reading: mercermuseum.org · Wikipedia · visitbuckscounty.com
last checked: 2026-07-19