Best natural monuments around Sesimbra (Castelo) are primarily found within the Arrábida Natural Park, an area known for its diverse landscape. This region features mountains, dramatic coastlines, and unique ecosystems, including rare Mediterranean maquis. The area combines historical richness with outstanding natural beauty, offering varied terrain for exploration. It is situated between Setúbal and Sesimbra, providing a gateway to numerous natural attractions.
Last updated: May 2, 2026
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Built in the 18th century, it is an eye-catcher with its baroque architecture and the typical blue and white tiles in which some icons were also kept.
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An excellent beach, although lacking in infrastructure and difficult to access, it's a super pleasant place, ideal for relaxing and recharging. Nearby, I also visited Mijona Beach and Hell Beach, which offer more challenging access but always boast immense natural beauty. I recommend it for those who don't have mobility issues and appreciate nature. 👍🥾🦯
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Don't miss the opportunity to sign the summit book. The summit book is located in the small plastic container with the green lid, covered with a stone.
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As it is a wild beach and difficult to access, there is no support equipment of any kind or lifeguards. Don't forget to bring water and food, and on the way back make sure to take all your rubbish with you (there are bins near the car park, at the start of the trail)! If you prefer to stay in the shade, you will need to bring a parasol. Also note that the name of the beach is Praia do Ribeiro do Cavalo and not Praia da Ribeira do Cavalo, as it is often called.
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The chapel was probably built in the 17th or perhaps 18th century, as a place of Christian worship that, most likely, succeeded other previous cults, namely those related to water or even initiation rites linked to the idea of the rebirth of the soul.
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Lapa de Santa Margarida is a natural grout at the base of Arrábida Mountain, where a small altar was erected. The access is done by a narrow path, with over 200 steps, until the sea level. Inside there is a Christian altar with some images and candles. The image of Saint Margaret was initially in this chapel, thus having given her name to this place.
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No one had ever heard of this wild beach until recently, when social media, bloggers, and travel websites began showing photos of its stunning scenery. It wasn’t even marked on any map, and only a few locals knew that there was a trail leading down to one of Portugal’s most beautiful beaches. They kept it a well-guarded secret, but it’s now quite popular, including with tourists.
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At the top of the cliff that embraces Lagosteiros beach, a piece of prehistory stands the test of time: the Lagosteiros Natural Monument. Traces left by dinosaurs over 130 million years ago can still be seen imprinted in the yellowish limestone. Among the various fossilized trails, one stands out, measuring an impressive 50 meters long, a true trace of the past, engraved in stone.
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The area is rich in unique geological formations. A prominent example is the Lagosteiros Natural Monument, where you can observe dinosaur footprints imprinted in yellowish limestone, some dating back over 130 million years. Another fascinating site is Lapa de Santa Margarida Cave and Chapel, a natural grotto at the base of Arrábida Mountain, accessible via a path with over 200 steps.
Yes, several natural monuments offer breathtaking views. Formosinho Peak, the highest point in the Serra da Arrábida at 501 meters, provides extensive panoramic views connecting the Sado estuary to the Tagus. Cabo Espichel also features impressive cliffs and a lighthouse, offering a sense of grandeur and isolation with vast ocean vistas.
The Arrábida Natural Park is renowned for its idyllic coves. Ribeiro do Cavalo Beach is particularly famous for its stunning scenery and clear, turquoise waters, offering a wild and natural alternative to more commercial areas. Other notable beaches within the park include Praia dos Galapinhos, Praia do Creiro, and Praia dos Coelhos, all known for their fine sand and transparent waters.
The Arrábida Natural Park is home to diverse flora and fauna, including rare Mediterranean maquis. For birdwatching enthusiasts, Lagoa Pequena is a designated Special Bird Protection Zone and an important observation route for bird nests in Europe, offering a fantastic ecological environment with pine woods and reeds.
Yes, the area offers options for families. The dinosaur footprints at Lagosteiros Natural Monument provide a unique paleontological attraction that can fascinate children. Additionally, the Sanctuary of Our Lady of Cape Espichel is listed as family-friendly and combines historical interest with impressive coastal views.
The Arrábida Natural Park offers numerous trekking paths. For easy hikes, you can explore routes like the 'Cape Espichel – Cape Espichel Lighthouse loop' or the 'View of the Arrábida Coast loop' starting from Pedra da Mua Natural Monument. More challenging routes, such as the ascent to Formosinho Peak, are available for experienced hikers. You can find more details on various hiking trails in the Easy hikes around Sesimbra (Castelo) guide.
Absolutely. The region provides diverse terrain for outdoor activities. There are several cycling routes, including challenging ones like the 'Ecocamping Beach – Porthino Coastal View loop'. For runners, options range from easy loops around Sesimbra Harbor to more difficult trails like the 'Ribeiro do Cavalo Beach – Praia de Sesimbra loop'. Explore more routes in the Cycling around Sesimbra (Castelo) guide and the Running Trails around Sesimbra (Castelo) guide.
The Sanctuary of Our Lady of Cape Espichel is a significant historical and religious site, featuring a convent, church, and pilgrim accommodations, all set against the dramatic backdrop of Cabo Espichel's cliffs. Its origins date back to the 14th century. The Lapa de Santa Margarida Cave and Chapel also holds historical significance as a place of Christian worship within a natural grotto.
The region can be enjoyed year-round, but spring (March to May) and autumn (September to November) offer pleasant temperatures for hiking and exploring, avoiding the peak summer heat. During these seasons, the vegetation is lush, and the weather is generally mild, making outdoor activities more comfortable.
Visitors frequently praise the stunning natural beauty, especially the contrast between the blue sea, white chalk cliffs, and green Mediterranean vegetation of the Arrábida Natural Park. The unique geological features, such as the dinosaur footprints at Lagosteiros Natural Monument, and the secluded, clear waters of Ribeiro do Cavalo Beach, are also highly appreciated. The panoramic views from spots like Formosinho Peak are often highlighted as unforgettable experiences.
While now more popular due to social media, Ribeiro do Cavalo Beach was once a well-kept secret known only to locals, offering a secluded and wild beach experience. For those seeking a unique blend of nature and spirituality, the Lapa de Santa Margarida Cave and Chapel provides an intimate and less-trafficked natural grotto with historical significance.


Extend your search for the best caves by checking out these guides of the top ones around Sesimbra (Castelo):