Portsmouth is Britain's naval city — a place whose entire geography has been shaped by the Royal Navy for four centuries, from the Tudor dockyard to the Palmerston forts that ring the Solent. Its abandoned places are overwhelmingly military: a 19th-century coastal fort on the Gosport shore, a WWII underground fuel bunker drilled into the Portsdown chalk, and a Naval hospital that operated from 1753 to 2009. Here are 5 of the best abandoned places in Portsmouth, selected from our Abandoned Places Map UK — 640+ GPS locations across England, Scotland, Wales and Ireland.
Why Portsmouth Is a Hidden Gem for Urban Exploration
Portsmouth is one of the richest military urbex landscapes in England — the Solent's strategic importance meant that every century from the 16th to the 20th left military infrastructure across the city and its hinterland. The Palmerston Forts of the 1860s-1880s, the WWII underground network, and the Naval hospital heritage create a layered military abandonment that is largely inaccessible to the casual visitor but extraordinarily rewarding for the prepared urban explorer.
1. Fort Gilkicker – Gosport, Hampshire — 1863 Palmerston Fort, Solent Coastal Defence, Abandoned by the Military, Circular Casemated Battery Intact (Known Location)
Fort Gilkicker at Gosport is one of the most atmospherically complete Palmerston Forts on the Solent — a circular casemated coastal battery built in 1863 to defend the approaches to Portsmouth Harbour from the threat of French naval attack. The fort's distinctive circular plan, its heavy stone casemates, the hand-painted "FORT GILKICKER" sign above the entrance, and the gun emplacements facing the Solent make it one of the most characterful and most well-documented abandoned military sites near Portsmouth. Documented by multiple urbex photographers and referenced consistently on 28DaysLater Hampshire.
🔗 Learn more: Wikipedia – Fort Gilkicker
2. Portsdown Underground Fuel Bunker – Portsdown Hill, Hampshire — 1930s WWII Bombproof Underground Oil Reservoir, Royal Navy Fleet Supply, Tunnels Still Intact (Known Location)
The Portsdown Underground Fuel Bunker was built in the late 1930s by Sir Robert McAlpine's construction company — a bombproof underground oil reservoir drilled into the chalk of Portsdown Hill to supply the Royal Navy fleet at Portsmouth in the event of aerial attack destroying surface fuel storage. The underground tunnels, the pump chambers, and the infrastructure of a facility built to keep the Royal Navy supplied through a sustained bombing campaign make Portsdown one of the most historically specific and most atmospherically extraordinary WWII heritage sites near Portsmouth. Documented on 28DaysLater Hampshire.
🔗 Also read: Top 5 Abandoned Places in England →
3. Royal Hospital Haslar – Gosport, Hampshire — 1753 Royal Naval Hospital, Oldest Surviving Purpose-Built Naval Hospital in Britain, Closed 2009, Grade II* Listed (Known Location)
Royal Hospital Haslar at Gosport is the oldest surviving purpose-built Naval hospital in Britain — opened in 1753 to treat sailors of the Royal Navy, serving continuously through every major naval conflict from the Seven Years War to the Falklands before finally closing in 2009. The extraordinary Georgian brick complex, the colonnaded courtyard, the original surgical theatre, and the remarkable survival of a 250-year-old Naval medical institution make Haslar one of the most historically significant and most atmospherically extraordinary abandoned buildings in Hampshire. Grade II* listed; extensively documented by urban explorers.
🔗 Learn more: 28DaysLater – Portsmouth Urbex Reports
4. Solent Victorian Sea Fort – 1860s-1880s Palmerston Island Fort, Gun Decks and Casemates Still Intact, Solent Setting (Our Map Exclusive)
A Victorian Palmerston island fort in the Solent — the original gun decks with their casemate positions facing the naval approaches to Portsmouth, the magazine system below the waterline, and the barrack rooms where the garrison lived in isolation above the tidal channel. The Solent's island forts were built in the 1860s-1880s to create a defensive ring around Portsmouth; several remain largely inaccessible and largely intact. GPS coordinates available with our England Urbex Map.
5. Hampshire Georgian Country House – 18th-Century Mansion, WWII Military Requisition, Grand Staircase and Library Intact, Rural Portsmouth Hinterland (Hidden Gem — Our Map Only)
An 18th-century country house in the rural Hampshire hinterland behind Portsmouth — the original grand staircase still intact, the library with period shelving, and the evidence of WWII military requisition still visible in the fabric of the rooms. The house served as a military billet during WWII; post-war death duties and the damage of military occupation made restoration unviable. Find it on our map — with access rating and condition report.
❓ FAQ
What is the most famous abandoned place in Portsmouth?
Fort Gilkicker at Gosport — a circular casemated Palmerston Fort built in 1863 to defend the Solent, with the original "FORT GILKICKER" hand-painted sign above the entrance still legible after decades of abandonment. One of the most characterful military ruins in Hampshire.
What was Royal Hospital Haslar?
The oldest purpose-built Naval hospital in Britain — opened in 1753 at Gosport, serving Royal Navy sailors through every major conflict for 256 years before closing in 2009. The Grade II* listed Georgian complex is one of the most historically significant abandoned buildings in Hampshire.
What were the Palmerston Forts?
A ring of coastal and island forts built around Portsmouth in the 1860s-1880s following a Royal Commission report warning of French naval threat — nicknamed "Palmerston's Follies" because France never attacked. The forts are among the most intact Victorian military structures in Britain.
Safety Tips
- Underground bunkers: the Portsdown fuel bunker has confined, unventilated sections — never enter underground military spaces alone and always carry two independent light sources
- Tidal access: Solent island forts are accessible only at certain tidal states — always check tidal conditions before any water crossing and never attempt access in deteriorating weather
- Never explore alone — always bring at least one other person
The urbex code: "Respect the decay. It tells the story."
🎯 Summary
Portsmouth's abandoned places range from a Palmerston Fort with its original hand-painted sign to a WWII underground fuel bunker drilled into the Portsdown chalk and the oldest Royal Naval hospital in Britain, closed after 256 years of service. Each of these 5 derelict buildings in Portsmouth captures a different layer of Britain's most militarised city.
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