A cave with a fallen roof
The sea cut the cliff and the roof then collapsed, leaving the chasm the waves surge into.
Beatriznog10 — CC BY-SA 3.0 · claralieu — CC BY 2.0 · claralieu — CC BY 2.0 · claralieu — CC BY 2.0
In winter or on a stormy day, when the sea is up and the waves drive into the chasm. In calm summer you will find it pretty but still, and many visitors leave unimpressed because they came at the wrong time rather than because the place lacks anything.
Not on its own. But Cascais as a whole deserves a day: an attractive coastal town reached directly by train from Lisbon in about forty minutes, with beaches, museums and a marina. Make Boca do Inferno a stop within that day.
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A coastal rock formation west of Cascais, where the sea cut a cave into the cliff and its roof then partly collapsed, leaving a chasm that waves surge into and out of with a roar. The name means "mouth of hell". The spectacle depends entirely on the sea: on a calm summer day you will find rocks, blue water and little movement, and may wonder what the fuss is about. On a stormy winter day the waves drive hard into the chasm and the spray goes high, and that is the scene the reputation rests on. The site has walkways, viewing platforms and railings, and it is easy to reach on foot or by bicycle from central Cascais along the coast. There is no ticket and no schedule. An important safety point: the railings are there for a reason. The rocks beyond them are slippery and the waves unpredictable, and accidents have happened. Do not go past the barriers for a photograph however safe it looks, particularly on the stormy days when the waves are at their most impressive and most dangerous at once.
The sea cut the cliff and the roof then collapsed, leaving the chasm the waves surge into.
The rocks beyond are slippery and the waves unpredictable, and accidents have happened.
The coast path from the town centre is attractive on foot or by bicycle.
West of Cascais town, on the Atlantic coast