Fort San Juan (Inmaculada Concepción)
El Castillo, Nicaragua
Fortaleza de la Inmaculada Concepción, El Castillo, Río San Juan, Nicaragua
MUSEUM
VISITOR INFORMATION
Check river transport, opening arrangements and current access with the local operator. The Event's March 17 date concerns the expedition's beginning rather than necessarily the fortress's capture. Map point reviewed October 3, 2026: Museu EXEA fortifications catalogue published coordinate for Castillo de la Inmaculada Concepción, corroborated with Nicaragua's surviving fortress identity. Visitor information reviewed October 3, 2026: Fortress and museum interpretation are verified. Published museum hours are Tuesday–Friday 8 a.m.–4:30 p.m., Saturday–Sunday 9 a.m.–4 p.m.; confirm before travel. Published travel guidance describes boat access from San Carlos. Parking and visitor toilets at the fortress remain unverified.
Visitor amenities reviewed October 3, 2026: No confirmed information was found for visitor parking and public restrooms. The NO entries reflect unverified provision, rather than confirmed absence. Check locally before relying on facilities.
Fortaleza de la Inmaculada Concepción museum/interpretive center: Tuesday–Friday 8 am–4:30 pm, Saturday–Sunday 9 am–4 pm. A current admission fee was not listed in the national culture institute’s museum directory. Confirm holidays and river transport separately.
Peak visitation season unconfirmed. No reliable site-specific annual monthly attendance pattern was established.
February-March for the fortress museum and river journey during relatively less-rainy months. Confirm museum opening and boat connections separately; showers remain possible year-round.
OFFICIAL WEBSITE
TICKET INFORMATION
HISTORIC SITES NEARBY
Nearby Historic Sites
miles
Landmark
WHO WAS HERE
0
PEOPLE WHO LIVED HERE
About Fortaleza de la Inmaculada Concepción / Fort San Juan
The Fortress of the Immaculate Conception, also known as Fort San Juan, guarded the San Juan River in Nicaragua. British forces captured it during an expedition in 1780 in which Horatio Nelson took part. The stronghold connected river defense with imperial ambitions across Central America.
The surviving fortress at El Castillo is a heritage destination with a history extending beyond the 1780 expedition. Individual surviving features require dating before they can be identified specifically with the British attack.
History happened here at Fortaleza de la Inmaculada Concepción / Fort San Juan
Britain's 1780 expedition sought control of the San Juan River route. Nelson assisted the operation that captured the Spanish fortress, but disease devastated the expedition. The campaign failed to produce lasting British control despite the temporary military success.
A contemporary portrait of Nelson later reflected the effects of illness and included the fortress in its background. The surviving stronghold and documentary evidence connect the episode to a larger contest over Caribbean and Central American routes. Its earlier construction and later history remain important parts of the site's identity.
PEOPLE WHO DIED HERE
PEOPLE AT REST HERE
EXTERNAL LINKS
Research reviewed October 3, 2026. Event IDs d76a3139-886b-442b-8ee5-76d05db3068d; Events Latest 10PM.csv rows 495.
https://www.rmg.co.uk/collections/objects/rmgc-object-14374
https://www.inc.gob.ni/wp-content/uploads/2023/03/R%C3%8DO-SAN-JUAN-31-03-23.pdf
https://www.museuexea.org/fortificacoes/castillo-de-la-inmaculada-concepcion
https://www.visitanicaragua.com/5-destinos-slow-en-nicaragua/
Map location reviewed October 3, 2026. Museu EXEA fortifications catalogue published coordinate for Castillo de la Inmaculada Concepción, corroborated with Nicaragua's surviving fortress identity.
Visitor classification and amenities reviewed October 3, 2026. Destination: Fortaleza de la Inmaculada Concepción and museum, El Castillo, Río San Juan.
https://www.inc.gob.ni/museos/
https://www.intur.gob.ni/2017/09/14/hagamos-patria-este-fin-semana-castillo/
Prose batch 4 researched October 3, 2026. Fast pass; proofing pending. Royal Museums Greenwich collection record and Nicaraguan heritage references reviewed. Proof chronology and surviving fabric; avoid unsupported mortality totals. Existing image licensing columns remain unchanged.
Visitor admission and access fields reviewed October 3, 2026. Destination: Fortaleza de la Inmaculada Concepción and museum, El Castillo, Río San Juan.