A house at Mill Run in Stewart Township, Pennsylvania [FACT-0022], designed by Frank Lloyd Wright [FACT-0023] and completed in 1937 [FACT-0032] as a defining example of his organic architecture [FACT-0024]. It is a National Historic Landmark and a UNESCO World Heritage Site [FACT-0025].
Location: Mill Run, Stewart Township, Pennsylvania, United States
Verified facts
- Located in Mill Run, Stewart Township, Pennsylvania
confidence 75/100 · 3 independent sources · SRC-0031, SRC-0032, SRC-0033 - Designed by Frank Lloyd Wright
confidence 75/100 · 3 independent sources · SRC-0031, SRC-0034, SRC-0033 - Architectural style: Organic architecture
confidence 75/100 · 3 independent sources · SRC-0032, SRC-0034, SRC-0033 - Historic designation: National Historic Landmark; National Register of Historic Places; UNESCO World Heritage Site (The 20th-Century Architecture of Frank Lloyd Wright)
confidence 75/100 · 3 independent sources · SRC-0031, SRC-0032, SRC-0033 - Built in 1937
confidence 75/100 · 3 independent sources · SRC-0031, SRC-0044, SRC-0033
Evidence & sources
- SRC-0031 — NPS — NRHP/NHL Inventory-Nomination Form (Fallingwater) (Tier 1, official_archive; retrieved June 2026)
- SRC-0032 — Western Pennsylvania Conservancy — Fallingwater (official operator) (Tier 1, owner_statement; retrieved June 2026)
- SRC-0033 — Encyclopaedia Britannica — Fallingwater (Tier 3, encyclopedia; retrieved June 2026)
- SRC-0034 — ArchDaily — Frank Lloyd Wright's Fallingwater Reopens After Restoration (Tier 2, journalism; retrieved June 2026)
- SRC-0044 — ExplorePAHistory (PA Historical & Museum Commission / WITF) — Fallingwater marker (Tier 2, scholarship; retrieved June 2026)
How we verify
Every fact above is independently corroborated by at least two reputable sources and
confidence-scored before publication. Claims that cannot clear that bar are withheld. We publish
location only at neighborhood/city granularity — exact street addresses and personal information
are structurally barred from publication. Last reviewed June 2026.