Castillo San Felipe del Morro

For almost four centuries El Morro guarded the entrance to San Juan Bay, the key to Spain’s Caribbean empire. Work on a first tower began in 1539, and over the next 250 years the fort grew into a massive multi-level stone citadel stepping down the headland to the sea. It saw off Sir Francis Drake in 1595, fell briefly to the Earl of Cumberland in 1598 – whose men were driven out by dysentery rather than by the garrison – and withstood a Dutch siege in 1625 and a British attack in 1797. The Irish-born engineer Thomas O’Daly gave it much of its final form in the late 18th century. US warships shelled it in 1898, and it served as a US military post through both world wars.

Since 1949 it has been the heart of San Juan National Historic Site, run by the National Park Service, and in 1983 it was inscribed with the old city’s fortifications as a UNESCO World Heritage Site. Below its walls on the seaward side lies the Santa María Magdalena de Pazzis cemetery, the resting place of many of Puerto Rico’s notable families, which adds to the atmosphere of any evening walk along the ramparts.

El Morro’s own ghost lore is gentle and largely the stuff of evening walking tours. The most repeated figure, passed on in travel writing and tour patter, is a woman in a white dress said to drift along the ramparts – in some tellings looking out to sea for a lover lost in battle. Others describe a Spanish soldier still pacing his post, with footsteps, the clink of metal and murmured voices in the vaults after dark. None of these stories is attributed to named witnesses, and the National Park Service presents the fort as history, not as a haunted attraction.

The most famous ghost story of San Juan’s defences belongs to the same system of walls: the Garita del Diablo, or Devil’s Sentry Box, an isolated garita on the rocks below Castillo San Cristóbal at the other end of the old city. According to the legend, which is usually said to date from the 17th century (the garita itself was built in 1634), a soldier named Sánchez failed to answer the night-time call of “¡Alerta!” passed between sentries; when his comrades reached the box, it was empty except for his weapon and uniform. Some said the Devil had taken him; a version shared by the National Park Service has him deserting to elope with a young woman who met him at the box. Guards are said to have long avoided the post, and some visitors claim to hear guitar music or laughter from it at night.

The garita itself – the domed stone sentry box hanging off the corner of a bastion – has become the symbol of Puerto Rico, and El Morro’s are among the most photographed. Whatever one makes of the ghosts, standing in one at dusk with the Atlantic below explains why soldiers on lonely night watches told stories.

A woman in white on the ramparts; a phantom sentry pacing the walls; footsteps, metallic clanking, whispers and cold spots in the vaults and tunnels. At the nearby Garita del Diablo, a vanished soldier, guitar music and mocking laughter. Reports come mostly from tour guides and visitors and are passed on as folklore.

The upper ramparts and the garitas overlooking the sea; the lower batteries and vaulted rooms. The Devil’s Sentry Box is a separate site below Castillo San Cristóbal, seen from Calle Norzagaray. Stories focus on dusk and night, when the forts are closed.

The Garita del Diablo legend is one of Puerto Rico’s best-known traditional tales and a staple of Old San Juan ghost walks and cruise-ship evening tours. The garita is a national emblem, found on Puerto Rican souvenirs, artwork and tourism branding.