Boca do Inferno

A large coastal cavern in terrain around 150 million years old, along the Cascais cycle route.

The municipality highlights the large cavern in terrain around 150 million years old. Boca do Inferno is among the places identified along the Cascais cycle route.

It is in Cascais: see below the trips from Lisbon that go there.

Independent itineraries to do on your own. We do not sell tours, recommend tour operators or use affiliate links. Check timetables, tickets and access with official sources before you set off.

Trips from Lisbon to Cascais

Beach · Heritage

Cascais and Estoril along the coast

A riverside and seaside train ride to an elegant former fishing town, with a flat promenade linking beaches and forts.

4-6 hours
about 30 km
Train, Car
Good accessibility
No booking needed

Nature · Heritage · Beach

Sintra, Cabo da Roca and Cascais

Make an independent train-and-bus loop through Sintra’s centre, Atlantic scenery at Cabo da Roca and Cascais before returning to Lisbon.

9-12 hours
about 30 km
Train, Bus
Partial accessibility
No booking needed

Beach · Heritage

Cascais and Estoril by train

Leave Lisbon on the Cascais line, explore the town and follow the seafront to Estoril on an independent half-day outing by the ocean.

4-6 hours
about 32 km
Train
Partial accessibility
No booking needed