A coastal battery near where you are standing was armed against Spain, rearmed for a civil war, then left to fall apart.
Last reviewed 20 September 2026 · A two-minute read · 4000 BC–now
The short answer
The Fort of Cresmina, built in 1762 near Cascais during the Fantastic War between Portugal and Spain, was rebuilt for King Miguel I between 1830 and 1832 during the Portuguese Civil War, then disarmed by his retreating army on 24 July 1833 and left to fall into ruin.
Guincho-Cascais, Portugal — 2006 · Pedro Ribeiro Simões from Lisboa, Portugal · CC BY 2.0
1762 and before
A fort was built to hold invaders off Cresmina beach
The Fort of Cresmina went up 442 meters from where you're standing, on the southern end of Cresmina beach. It was built in 1762, during the so-called Fantastic War between Portugal and Spain. Europe's Seven Years' War was raging at the same time. Portugal feared a Franco-Spanish landing on this stretch of coast. The Count of Schaumburg-Lippe was a German mercenary general. Portugal hired him to reorganize its defenses. He oversaw the building of three small batteries along two kilometers of shoreline here. They covered Cresmina beach and Guincho beach to the north. Cresmina's job was to hold a small garrison that could delay any troops coming ashore, buying time to reinforce Lisbon, 18 miles away. It also crossed its cannon fire with the nearby Fort of São Brás de Sanxete. No invasion ever came. The fort was rebuilt once, in 1793, but sat unused through the Peninsular War two decades later. By the early 1820s, it was quietly deactivated and left empty.
A king would need it again, briefly.
1828 to 1833
A king rebuilt the fort, then his army abandoned it
During the Portuguese Civil War, King Miguel I ordered the abandoned fort rebuilt and expanded. The work ran from 1830 to 1832, giving the old battery new walls and a new garrison. It didn't last. On July 24, 1833, Miguel's army disarmed the fort and pulled out as his forces retreated. Nobody replaced them. The fort fell into ruin over the following decades. Money was set aside to repair it in 1850, but the repairs never happened. By 1854 it was already collapsing.
A king rebuilt it for a war he lost within the year.
1755
An earthquake did more damage than any invasion
The fort's failures weren't the coast's worst disaster. In 1755, an earthquake tore through Cascais, a town that had held its charter since 1364. It leveled buildings across the settlement in minutes. No army had managed that kind of damage in a century of watching this shoreline. Cresmina's cannons never fired on an invader, but the ground itself did more harm than Spain ever threatened.
The sea kept its own list of wrecks here.
1575 to 1625
A merchant ship sank off this coast unseen for centuries
Somewhere between those years, a merchant ship went down off this coast carrying spices, Chinese ceramics, and bronze cannons. Divers found it again in 2018, resting 12 meters underwater near the mouth of the Tagus estuary. The forts above the water were built to stop soldiers landing on the sand. The real danger came from the sea itself, and it didn't need a war to make it dangerous.
The coast's deadliest enemy was never the one it armed against.
Roman period
Roman workers salted fish on this shore
Long before anyone thought to fortify this shore, people worked it. On Rua Marques Leal Pancada, in the center of Cascais, diggers found ten large tanks cut into the rock. Roman workers used them to salt fish for trade, part of a production line that ran along this coast for generations. There was no garrison here, no walls, no cannon. Just tanks, brine, and fish headed for a market somewhere else. The shore fed people before anyone armed it.
February 2026
Storms battered this coast and left it foam-blanketed
The invasion this coast gets now comes from the sky. In February 2026, a string of storms battered Cascais and its surf beaches. They dumped flood water across the region. They killed 14 to 15 people in Portugal, Spain, and Morocco combined. Sea foam piled up on the beaches afterward in a blanket nobody had seen before. The old batteries never fired a shot at anyone. The weather doesn't ask permission, and it doesn't need a fleet.
The Fort of Cresmina still stands over the beach it was built to defend, empty of everything but the sea wind.
Open this place in Strata
Every person, building and event in this story opens into its own dig in the app — and it will dig the ground you are standing on instead, wherever that is.
Excavations at Rua Marques Leal Pancada in Cascais uncovered ten large Roman tanks built for salting and processing fish, evidence of a working waterfront near where you stand.
Sometime between 1575 and 1625, a large merchant ship carrying spices, Chinese ceramics and bronze cannons sank off Cascais, and was only found in 2018, 12 meters underwater.
Loaded with pepper and East Indies cargo, the ship went down off the Cascais coast in 1606 and became a landmark wreck for studying Portuguese maritime trade.
The Bateria Alta, a coastal artillery battery just 221 meters from here, was built around 1750 to guard this stretch of Atlantic coast, and later became a restaurant.
Built in 1762 at the south end of Cresmina beach to defend against seaborne attack, the fort was sold into private hands in 1889 and, as of 2021, was being turned into a restaurant.
Deadly storms in February 2026 caused catastrophic flooding across Portugal, Spain and Morocco, with Cascais's surf beaches left blanketed in an unusual sea foam.
Built in 1762 during the Fantastic War, the fort was meant to delay any Franco-Spanish landing and buy time to reinforce Lisbon. It was rebuilt in 1793, deactivated by the early 1820s, rebuilt again for King Miguel I between 1830 and 1832, then disarmed and abandoned by his army in 1833.
Why was the Fort of Cresmina built?
It was built in 1762, during the Fantastic War between Portugal and Spain, out of fear that French and Spanish forces might land on this stretch of coast. The Count of Schaumburg-Lippe oversaw its construction as part of three small batteries covering Cresmina and Guincho beaches.
What was here before the fort at Cresmina?
Long before any fort was built, Roman workers cut ten large tanks into the rock nearby, on Rua Marques Leal Pancada in central Cascais, to salt fish for trade along this coast.
Did the Fort of Cresmina ever see combat?
No invasion ever came, and its cannons never fired on an invader. The greatest damage to the area came instead from the 1755 earthquake, which tore through Cascais and leveled buildings across the town.
What shipwreck was found off the coast of Cascais?
A merchant ship carrying spices, Chinese ceramics and bronze cannons sank off this coast sometime between 1575 and 1625. Divers found it again in 2018, resting 12 metres underwater near the mouth of the Tagus estuary.
What happened in Cascais in February 2026?
A string of storms battered Cascais and its surf beaches, dumping flood water across the region and killing 14 to 15 people across Portugal, Spain and Morocco. Sea foam piled up on the beaches afterward in an unusual blanket.
