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Boca do Inferno

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Boca do Inferno

The 'Mouth of Hell': a collapsed sea cave on the cliffs west of Cascais where Atlantic waves crash and spray through a rocky arch.

Tickets & tours Open in Google Maps
Time needed
30 min
Entry
Free
Best time
Stormy days or sunset
Area
West coast

Waves crashing into a sea cave.

Where it is & how to get there

Address: Av. Rei Humberto II de Itália, 2750 Cascais

  • On foot: 20 minutes along the coast from Cascais.
  • Bike: Free town bikes.
  • Bus: Local buses to Guincho.

The story of Boca do Inferno

The cave roof collapsed long ago, leaving a natural arch and deep chasm.

In 1930 a famous occultist staged his fake disappearance here.

Best time to visit

Best season

Autumn and winter for big waves.

Best time of day

Sunset.

Calm days

Less dramatic in summer.

Tips before you go

  • Best on stormy days.
  • Stay on the viewing platforms.
  • Continue to Guincho by bike.

Best hotels near Boca do Inferno

Well-known hotels within easy reach. Check prices and availability for your dates.

Hotels near Cascais Marina

Seafront.

See prices

Hotels in Cascais

Town.

See prices

Hotels in Estoril

Beach area.

See prices
All hotels near Boca do Inferno

What's around Boca do Inferno

  • Cascais20 minutes on foot.
  • Guincho Beach15 minutes by car.
  • Cabo da Roca25 minutes by car.

Questions travellers ask

Is it free?

Yes.

How long do I need?

30 minutes.

Is it safe?

Yes, from the platforms.

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Travel Plan · Boca do Inferno Travel times, prices and opening hours change. Check official sites before you go. Photos: Unsplash. Privacy & disclosure · Contact us