Are you visiting Cascais, Portugal? Then you should see Boca do Inferno. It is a renowned sea arch and cave formation carved by the Atlantic Ocean. The coastline boasts impressive limestone cliffs battered by the ocean’s waves. Boca do Inferno means “Mouth of Hell” and it features a wide-open cave that extends into the sea, creating a spectacular and striking natural sight. The eroded cliffs also lend beauty to the dramatic scenery.
This site is not only visually captivating but also accessible for exploration. You can get a closer look at the cave and experience the power of the ocean firsthand. Cascais provides an opportunity for both adventure seekers and those looking for a more relaxed experience.
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How Do I Get to the Boca Do Inferno?
Boca do Inferno is a little over a mile west of Cascais. For most day visitors, the train from Lisbon is the go-to, with a direct service from downtown Cais do Sodre station running every 20-30 minutes during daylight hours. When the sun’s shining, a favorite move is strolling or biking along the coast from the train station or town center. Just cruise past the marina and lighthouse, then stick to the road. And if you’re feeling a bit lazy or want a quicker ride, taxis or cars are good to go. Decent street parking is around but heads up, it might fill up when things get bustling.
This spot is a year-round gig and the best part? There is no entry fee! Once you roll up, catch the epic view of Boca do Inferno from the cliff’s peak or stroll down the rock-cut paths on both sides. And guess what? Souvenir stalls with the coolest swag are available, plus, there is a sweet cafe serving snacks and drinks. And if nature calls, no worries — there are public toilets. Also, you can park your car on-site for a fee.
Pro Tip: Plan your visit around sunset for killer pics, then walk back to Cascais. Need a ride home? Trains back to Lisbon are on duty until way past midnight.
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Finding Your Way Around the Cliff
Choose your adventure at Boca do Inferno: soak in the nature show from above, or take a risk and descend into the pit (though it’s uneven and not recommended). The rocky cliffs fuel your imagination about hell’s supposed look. Enjoy the ocean view, get lost in the rhythmic waves, or stroll down Portugal’s only cycle path on Avenue Rei Humberto II de Itália to the coastline.
Don’t be puzzled by the dramatic name, especially during tranquil times when it looks anything but scary — more like peaceful. But hit it up during winter storms, and you’ll get the hellish experience. Massive waves boil down in the pit, smashing against the walls and soaring even higher than the cliffs. The splashing turns into a roar, making you believe you’ve stepped into hell’s fury.
Also, you can catch the views from both sides of the mouth. Start with the backside view, then stroll down the path to the other side and witness the waves crashing in — slightly mesmerizing. For some cliffside pics, head left, but watch out, the rope barrier stops halfway. Nothing is holding you back there, so you better be cautious. Be careful not to slip and fall because it’s a long way down.
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What Else Is There to Do After Boca Do Inferno?
Tourists usually kick it at Boca de Inferno for about half an hour. After you’ve soaked in the wave drama (or enjoyed the chill vibes, depending on the season), you’ve got a couple of cool options for other spots in the area.
Now, let’s talk Cascais. This old fishing village has upgraded to a buzzing hotspot for both locals and tourists while keeping that chill seaside charm intact. Picture this: three cozy beaches snuggling up to the old town.
Cascais is a foodie’s dream with top-notch restaurants and killer gelato. But if you’re up for a fancy feast, hop in a taxi heading a few miles west to Praia do Guincho. This windy beach is a hit with kitesurfers, and you can spot them from Fortaleza do Guincho, the Michelin-starred restaurant perched on the cliffs.
Venture a few miles out, and you’ll hit Sintra — once the crib of the Portuguese royals and a hotshot day trip from Lisbon. Trying to squeeze in Cascais, Boca do Inferno, and Sintra in one epic day? Brace yourself for a marathon of sights from sunrise to sunset.
What’s More?
Boca do Inferno made history as the star of one of the first films in 1896, titled “A Sea Cave Near Lisbon.” And here’s more: the cave witnessed a scandalous stunt by the British mystic Aleister Crowley, who faked his suicide here with poet Fernando Pessoa’s help. The rock even has a table commemorating the trick and suicide note. This natural wonder is open anytime, and you can explore it for free. Don’t miss it — and don’t forget your camera!
