Portugal’s sun-drenched beaches and vibrant cities often steal the spotlight—but beneath its surface lies a world straight out of a fantasy novel. From secret sea grottoes carved by tides to mystical inland caverns shrouded in legend, the caves of Portugal offer a magical escape into nature’s more mysterious side. Whether you’re paddling through sea arches at sunrise, descending into vast underground chambers, or stumbling upon hidden waterfalls in limestone enclaves, these lesser-known spots promise the kind of adventure that lingers in your memory long after you’ve left. Pack your sense of wonder—these 8 caves are waiting to be explored.

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1. Benagil Cave, Algarve

Tucked along the golden cliffs of the Algarve coast, Benagil Cave is one of Portugal’s most iconic yet still dreamlike locations. Accessible only by water, this natural dome opens up to the sky through a massive circular hole, letting sunlight stream in and cast a golden glow on the sandy floor. Kayak or paddleboard in for the most intimate experience, and go early to enjoy the silence before tour boats arrive. It’s no wonder this surreal cave often tops lists—but nothing compares to seeing it in person.

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2. Grutas de Mira de Aire, Santarém

Step into another realm just an hour north of Lisbon. Portugal’s largest public cave system, Grutas de Mira de Aire, winds through over 11 kilometers of limestone corridors, illuminated with colorful lights that enhance its otherworldly formations. Descend past towering stalactites and shimmering stone “curtains” as you learn about the cave’s ancient origins—some parts formed over 150 million years ago. It’s a mix of natural wonder and underground cathedral, perfect for curious minds and budding spelunkers.

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3. Furna do Enxofre, Graciosa Island, Azores

If Algar do Carvão is a fantasy novel’s enchanted forest, then Furna do Enxofre is its dark and brooding chapter. Hidden beneath a volcanic caldera, this massive underground dome is accessible via a spiral staircase that feels like a descent into the earth’s core. A sulphuric lake and geothermal steam vents hint at the raw power below, while rays of sunlight pierce through vents in the cave’s ceiling, adding an eerie beauty to the experience.

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4. Lapa da Moura, Alentejo

Nestled deep in Portugal’s tranquil Alentejo region, Lapa da Moura is steeped in legend. According to local folklore, this cave was once home to a “moura encantada”—an enchanted Moorish maiden guarding hidden treasure. Today, it remains a serene, semi-hidden spot near the town of Redondo, surrounded by wildflowers and cork oak trees. Small but mystical, this cave rewards slow travel and those who take time to ask locals for directions—GPS rarely gets you there.

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These caves aren’t just geological formations—they’re portals to Portugal’s quieter, more magical side. Whether you’re chasing natural beauty, ancient stories, or a bit of both, these hidden gems offer the kind of wonder you thought only existed in books.