Boca do Inferno

Boca do Inferno (literally, “the mouth of hell”) is a striking rocky archway and bay located near Cascais, just outside of Lisbon. Over the years, relentless ocean waves have eroded the soft limestone cliffs, resulting in a dramatic cave that eventually collapsed, leaving behind an impressive archway and a small bay. This natural wonder offers breathtaking views and is a must-see destination for travelers.