A chasm carved by centuries of Atlantic swell, near where you are standing, has drawn painters, tourists, a faked death, and real ones.
Last reviewed 22 September 2026 · A three-minute read · 2870 BC–1992
The short answer
Boca do Inferno, near Cascais, Portugal, is a sea chasm hollowed out by centuries of Atlantic swell, filmed in 1896 in one of the earliest natural-landmark films ever made, and long used by people seeking to end their lives, including the Austrian art historian Ernst Heinrich Buschbeck, who died there in 1963.
Cascais, Portugal — 2006 · Pedro Ribeiro Simões from Lisboa, Portugal · CC BY 2.0
1896
A camera at the cliff caught only the surf
The waves at Boca do Inferno have struck the same rock walls for centuries. The sea has hollowed out a chasm below the cliffs. The name means "Hell's Mouth," and it earned it honestly. Water forces its way into the chasm's floor and throws itself against the stone with enough force to be heard from the road above.
In 1896, a British filmmaker named Henry Short set up a camera on the cliff and pointed it at the water. The result, a short reel called A Sea Cave Near Lisbon, showed nothing but the surf hitting the rock. It is considered one of the earliest films ever shot outside a studio anywhere in the world. Nobody performed for that camera. The sea did the only thing it does here, and someone finally thought to record it.
The next person to use this cliff as a stage wanted the world to believe he was dead.
Early 1900s
People jumped here, and one faked it
Long before it was famous for a stunt, the chasm had a dark reputation. People came here to end their lives. They jumped deliberately, at the edge of the drop. That reputation held into the twentieth century and gave the site its darker local name, one that outlasted any single story attached to it.
The best-known visitor never actually died here. Local tradition holds that the English occultist Aleister Crowley staged his own disappearance at the chasm. He let people believe the sea had taken him. Then he turned up alive elsewhere. The story is told as legend, not as an inquest record. But it fits a place already known for staged endings and real ones on the same stretch of rock.
Ernst Heinrich Buschbeck was an Austrian art historian born in 1889. He died at Boca do Inferno in 1963. Wikidata records the place of death plainly, without the drama the location usually attracts. He had spent his career studying paintings in Vienna's museums. He ended his life on a cliff above the Atlantic. He jumped on ground that had already taken others. He died in a country far from his own.
The chasm earned its name from real deaths before anyone used it as a magic trick.
1 November 1755
An earthquake and its wave tore through the town
The sea did not always announce itself with a chasm. On All Saints' Day in 1755, a massive earthquake tore through Lisbon. It struck Cascais hard enough to destroy its Citadel and damage the local convent. The tsunami came next. Accounts from the time describe the water pulling back from the shore. It exposed the sea bottom. Then it surged forward and smashed into the boats in the harbor. Nearly a third of the town's people died from the earthquake, the fires that followed, and the flood. The cliffs at the chasm had no name for tragedy yet. The town below already had one.
Not every visitor to this coast came for the water. One came to paint it.
1890 to 1902
A count's house drew a painting king
A different kind of ending drew people to this shoreline too, an ordinary one. Casa de São Bernardo went up nearby between 1890 and 1902. It was built for a count named Bernardo Pinheiro Correia de Melo. He filled it with dinners for writers, including the novelist Eça de Queirós. King Carlos joined them sometimes. He was an amateur painter. He liked to set up his watercolors at the house and work quietly. The Atlantic sat outside the window. Nobody performed a death for him. He came to look at the sea, not to test it.
The wrecks off this coast never needed anyone to stage them.
1575 to 1625
A lost ship carried porcelain and slave-trade shells
Long before any camera or any staged disappearance, the sea near here was already taking ships for real. A Portuguese vessel went down off Cabo Raso sometime between 1575 and 1625. It stayed lost for four centuries. Divers found it in 2018. They pulled up bronze cannons stamped with the Portuguese coat of arms. They found Chinese porcelain from the Wanli period, peppercorns, and cowrie shells used in the slave trade. The wreck never got a legend or a name people repeat at dinner. It got silt, and then a survey team.
31 March 1952
A landslide derailed a train near the lighthouse
The weather took people here again in 1952, with no theater involved. Heavy rain fell on the slopes above the tracks. Years of poor upkeep had weakened them. Landslides came down. A train on the Linha de Cascais derailed near the Farol da Gibalta lighthouse. Ten people died. Thirty-eight more were hurt. Nobody had picked that spot for its reputation. The hillside simply gave way under a train doing what trains on that line did every day.
The chasm keeps taking the same shape it always has, hollowed out below the cliff, indifferent to who is watching.
Read the ground you are standing on
Every person, building and event in this story opens into its own dig in the app — and Strata will dig the ground under your feet instead, wherever that is, in about a minute, with every source shown.
Sourced records, high and medium confidence. Era background is marked as such.
Prehistoric
2870 BC to 2475 BC
Two radiocarbon samples taken about a kilometer from here have been dated to between roughly 3000 and 2475 BC, evidence of people on this ground in the late Neolithic.
The Church of Nossa Senhora da Assunção, the mother church of Cascais, has decoration dated to between 1520 and 1525 and appears clearly in a 1572 engraving of the town seen from the sea.
Sometime between 1575 and 1625 a Portuguese ship sank near Cabo Raso, its wreck later found holding bronze cannons, Wanli-era Chinese ceramics, peppercorns and cowrie shells tied to the Atlantic slave trade.
The Nossa Senhora dos Mártires, loaded with pepper and other Indian goods, went down off Cascais in 1606 and lay there for centuries before archaeologists identified it as the Pepper Wreck.
The Great Lisbon Earthquake on 1 November 1755 flattened the Citadel and damaged the local convent here, and the tsunami that followed wrecked boats in the bay after the sea withdrew and exposed the harbor floor.
Casa de São Bernardo was designed in 1890 and finished in 1902 for Bernardo Pinheiro Correia de Melo, First Count of Arnoso, who served as private secretary to King Carlos.
The Boca do Inferno chasm, where the Atlantic pounds through seaside cliffs, was captured in the 1896 British film A Sea Cave Near Lisbon, among the earliest moving pictures ever made of a natural landmark.
The Palácio dos Condes de Castro Guimarães, originally the Torre de São Sebastião, was built in 1900 as a rich family's summer residence and turned into a museum in 1931.
A train on the Linha de Cascais derailed near the Farol da Gibalta lighthouse on 31 March 1952, after landslides brought on by bad weather; ten people died and thirty-eight were hurt.
Prince Carlos of Portugal founded the Cascais Sporting Club in 1879 on an old parade ground; the site was later turned into the Museum of the Sea, opened in 1992.
A British filmmaker named Henry Short set up a camera on the cliff and filmed the surf striking the rock, producing A Sea Cave Near Lisbon, considered one of the earliest films ever shot outside a studio anywhere in the world.
What is the meaning of Boca do Inferno?
The name means 'Hell's Mouth', earned by the sea forcing its way into the chasm's floor and throwing itself against the stone with a force that can be heard from the road above.
Who died at Boca do Inferno?
Ernst Heinrich Buschbeck, an Austrian art historian born in 1889, died at the chasm in 1963, jumping on ground that had already taken others who came to the cliffs to end their lives.
What was here before the chasm became known for deaths?
The chasm's dark reputation for deliberate jumps predated its fame for a staged stunt; the site's darker local name outlasted any single story attached to it, including the legend that the occultist Aleister Crowley faked his own disappearance there before turning up alive elsewhere.
What happened to Cascais in the 1755 earthquake?
The Great Lisbon Earthquake on 1 November 1755 destroyed Cascais's Citadel and damaged the local convent, and the following tsunami pulled the sea back to expose the harbor floor before surging forward to smash the boats in the bay, killing nearly a third of the town's people.
What was found in the shipwreck off Cabo Raso?
Divers who found the wreck in 2018, lost since sometime between 1575 and 1625, recovered bronze cannons stamped with the Portuguese coat of arms, Chinese porcelain from the Wanli period, peppercorns, and cowrie shells used in the slave trade.
