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The rock arch of the Boca do Inferno with the sea entering the caveJakub Hałun · CC BY 4.0

What to do · Cascais and Estoril

Boca do Inferno

Viewpoint over a cave collapsed into the cliff · 20 min · Free · 2 km from the centre

InformationFree
Price
Free
Duration
30 min
Distance
2 km
Season
All year
Who it's for
Everyone; better with a swell
With a dog
On a lead; the viewpoint is on a public road

A limestone cave whose roof collapsed, leaving a hole open to the sea: in heavy swell, the water rushes in and rises in foam. It is about 2 km from the centre of Cascais along the coastal path, next to the Guincho road, and can be seen from railings at the cliff edge.

Go with a swell or at sunset, and do not go past the railings: the edge crumbles. On foot from the Cidadela it is about 25 flat minutes, passing the Santa Marta lighthouse.

With young childrenAs a familyWith teenagersWith a dog

Directions See all of Cascais and Estoril

Opening hours and prices can change: check them before you go.

Round off the plan

Where to eat, where to stay and what else to do

To eat nearby

The Mar do Inferno restaurant on the cliff, beside the sea© Mar do Inferno

Mar do Inferno

Restaurant · Cascais · €€€€

What to order: the grilled fish of the day, which you choose from the display case, and some shellfish to start.

Ice cream cones from Santini© Santini

Santini Cascais Baía

Café · Cascais · €€€€

What to order: a seasonal fruit sorbet and the flavour of the month.

The dining room of Furnas do Guincho with picture windows over the sea© Furnas do Guincho

Furnas do Guincho

Restaurant · Cascais · €€€€

What to order: some goose barnacles and a seafood rice for two (€82); if there are more of you, the cataplana caldeirada.

To stay nearby

The pousada inside the walls of the Cascais Cidadela© Pestana Hotel GroupHotel

Pestana Cidadela Cascais – Pousada & Art District

5 stars · Inside the Cidadela · Pool and spa · Dogs and cats up to 15 kg welcome

Dogs welcome

Why we like it: Five-star pousada inside the Cascais fortress, with 133 rooms, an outdoor and an indoor pool, a spa and artists' studios in the courtyard.

View details
The facade of the Hotel Baía facing Cascais bay© Hotel BaíaHotel

Hotel Baía

113 rooms · On the bay · Pool · 5 min from the station

Why we like it: Family hotel with 113 rooms right on the front line of Cascais bay, with a pool, free parking when booking direct and the station five minutes away.

View details
Guincho beach, next to the campsite© OrbiturCampsite

Orbitur Guincho

Open all year · Among pines, behind the dunes · Bungalows · Pets welcome

Dogs welcome

Why we like it: Campsite among low pines behind the Guincho dunes, open all year, with bungalows, a seasonal pool and a bus to Cascais station.

View details

Useful services

More to do nearby

Itineraries

Features in these plans

The wall of the Cascais Cidadela lit up at night
Day itinerary Cascais: bay, Boca do Inferno and Estoril Cascais and Estoril · 5 stops
The cliffs of the Boca do Inferno, which the route to Guincho passes
Day itinerary Guincho: surf lesson and cycle path Cascais and Estoril · 4 stops

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