Just minutes from Cascais’ center, Boca do Inferno (“Mouth of Hell”) is a dramatic rock formation carved by the sea, where Atlantic waves crash through an open arch, creating thunderous sounds and spectacular sprays.

Its name comes from the wild, almost otherworldly power of the ocean here – especially on stormy days. It’s the perfect spot for photography, watching the sunset, and feeling the raw force of nature.

With accessible viewpoints and a coastal walkway connecting it to central Cascais, it’s a must-see stop for any visitor.