1784-85 neoclassical villa built by John Penn — grandson of William Penn — now on the grounds of the Philadelphia Zoo, where zoo staff and a 2010 Ghost Hunters investigation have reported voices, music, and apparitions.
3400 W. Girard Avenue, Philadelphia, PA 19104
Age
All Ages
Cost
$$
Solitude House sits on the grounds of the Philadelphia Zoo and standard zoo admission applies; the house interior is not on the regular tour route — special interpretive access is occasionally offered by the Historical Society of Pennsylvania.
Access
Wheelchair OK
The Philadelphia Zoo grounds are largely accessible; interior of the 18th-century mansion has stairs and is not fully accessible.
Equipment
Photos OK
Est. 1785 · Country home of John Penn, grandson of William Penn · Most refined neoclassical residential interior in 18th-century Philadelphia · Original building on the grounds of the Philadelphia Zoo (1874) · Administered by the Historical Society of Pennsylvania
The Solitude is a small, two-and-a-half story Federal-period neoclassical villa built between 1784 and 1785 as the country retreat of John Penn (1760-1834), grandson of William Penn and one of the last members of the Penn proprietary family to make a home in Pennsylvania. The villa sits above the banks of the Schuylkill River in what is now West Fairmount Park, and is widely cited as the most architecturally refined surviving example of late-18th-century neoclassical residential design in Philadelphia.
John Penn lived at Solitude only intermittently before returning permanently to England in 1788, but the property remained in the Penn family until the City of Philadelphia acquired Fairmount Park in the mid-19th century. The Philadelphia Zoological Society opened the Philadelphia Zoo on the surrounding parkland in 1874 — making it the first chartered zoo in the United States — and incorporated the Solitude House into the zoo's grounds.
For much of the 20th century the Solitude House served working zoo functions: it was used as the zoo's reptile house, with reptile cages installed inside the elegant period interior, and later as administrative offices. The building was restored in the late 20th century, with period interpretation work overseen in partnership with the Historical Society of Pennsylvania, which administers the interior as a preserved historic space.
Solitude is open for limited public interpretation today — primarily through special Historical Society programs, occasional zoo-hosted events, and the building's annual appearance in Fairmount Park heritage programming. Its inclusion in the active zoo grounds means visitors regularly see the exterior, though the interior is not part of the standard zoo route.
Sources
Solitude House's haunted reputation among Philadelphia Zoo staff dates to the mid-20th century when the building was in active use as the zoo's reptile house and administrative offices. According to 6abc's 'Hidden Philadelphia: The Solitude House' feature and WPST radio coverage, the signature apparition is a woman in a long period dress, seen standing motionless at the top of the building's staircase. Multiple zoo employees over the decades have reported the figure, and the consistency of the description across personnel turnover is one of the reasons the account has remained the property's central paranormal claim.
A second recurring claim concerns the cryptoporticus — the partially-covered ground-level passage at the rear of the building — where staff have reported faint music with no identifiable source. Both 6abc and WPST coverage cite this phenomenon. Additional reports include full-body apparitions seen in the side rooms and the sound of footsteps in the empty upper floor.
The most-cited specific paranormal event was the April 2010 SyFy 'Ghost Hunters' investigation. The Philadelphia Inquirer's PhillyGossip blog confirmed the shoot in real time, and follow-up coverage by Ghost-Lounge and Haunted Journeys describes the TAPS team capturing what they reported as voices, humming, music, a door slamming, and unexplained footsteps inside Solitude House during their overnight investigation. The episode framed Solitude as one of the most evidentially active locations the team had visited in Philadelphia.
The Philadelphia Zoo itself acknowledges the paranormal reputation in low-key fashion through occasional Halloween-season programming, but the Historical Society of Pennsylvania's interpretation of the building remains primarily architectural and historical rather than paranormal. Among Philadelphia haunted-tour operators, Solitude is among the higher-confidence locations because multiple zoo-employee accounts and the on-camera TAPS investigation provide independent corroborating sources beyond pure folklore.
Notable Entities
Media Appearances
Visit the Philadelphia Zoo, on whose grounds the 1784-85 Solitude House stands. The mansion exterior can be viewed during normal zoo hours; interior access is typically reserved for Historical Society of Pennsylvania special programs and events.
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