Grutas de Mira de Aire

The Grutas de Mira de Aire, in the limestone hills of the Serra de Aire between Leiria and Fátima, are the largest show caves in Portugal. You walk down, deeper and deeper, through huge chambers full of stalactites, stalagmites and columns, until you are about 80 metres under the ground. Then a lift whisks you back up to daylight, which most children think is the best bit.

It’s a steady 18°C inside all year, so it works on a rainy day, a cold day or in a heatwave.

On 27 July 1947 people from the village went into a hole at a place called Moinhos Velhos (the old mills) and found a cave. Explorers, including international expeditions, kept pushing further through the 1950s. Building work to open it started in 1971, and the cave opened to visitors on 11 August 1974. In 1973, workers landscaping the site found another cave, the Gruta Nova, by accident. In 2023 cavers connected the Moinhos Velhos cave to the nearby Contenda cave, and the whole system is now about 11 kilometres long. The public route covers only about 600 metres of it.

Tours start with a short video. Then a guide leads you down through the cave, 683 steps in all, the longest single flight being 105 steps. Along the way you pass named chambers: the Grande Salão (the Great Hall), the Second Well, the Rio Negro (Black River), the Grande Lago (Great Lake) and the Main Gallery. There’s also an exhibition of photographs and a display of minerals and gemstones. At the bottom you take a lift up and come out about 300 metres from where you went in.

The guided explanation is in Portuguese. For English, download the free audio-guide app before you go; it works offline and also comes in Spanish, French, German, sign language and a simpler version for children.

Limestone is a rock made long ago from the shells and skeletons of sea creatures. Rainwater picks up a little carbon dioxide from the air and the soil, which turns it very slightly acidic, and over hundreds of thousands of years it dissolves the limestone along cracks, making tunnels and chambers. Where water drips from the ceiling, it leaves behind a tiny bit of rock each time. Stalactites grow down from the ceiling, stalagmites grow up from the floor, and when they meet they make a column. Ask the guide how long it took one to grow.

For older children who want more than a handrail, the cave runs a two-hour 5 Senses visit that leaves the lit path for a parallel gallery. You wear a helmet with a light and gloves, and you get to taste the cave water. Clothes will get dirty and wet and may tear, so wear old things and wellies; disposable overalls cost €5. It’s for ages 12 and up, in groups of two to eight, must be booked at least four days ahead, and cost €33 a person when checked in September 2026. The booking can be moved but not refunded.

Outside the cave there’s plenty for younger children. In a petting area they can meet rabbits, guinea pigs, pigs, hens, ducks, turkeys, pigeons, pheasants, peacocks and quail, and in a paddock they can hand-feed goats, sheep and donkeys. There’s a 4-metre sundial that tells summer time, winter time and solar time, and a restored windmill that shows how grain becomes flour. The Jardim dos Cheiros has labelled herbs to smell, and there’s a rock garden. A mineral exhibition, Natural Riches of the World, shows rocks, minerals, gems and fossils. The small fossil museum, with specimens from the Jurassic beach at São Bento, opens for booked groups only.

• Toddlers can come, carried, but 683 steps down is a lot of carrying and there’s no buggy access. The animals outside may be the highlight.
• Ages 5 to 7 usually manage the steps downhill and love the lift.
• Ages 8 to 12 get the most from the chambers, the formations and the science.
• Teenagers can book the muddy 5 Senses tour.

2026 prices were €9.50 from age 12, €5.70 for ages 5 to 11 and free for under-5s. You don’t need to book unless you’re a group of 20 or more adults or a school. Tours leave as visitors arrive, usually within 30 minutes. The caves open daily from 09:30, closing at 17:00 from October to March, 18:00 in April, May and September, and 18:30 from June to August. On 1 January it’s 10:00 to 17:00, and it’s closed only on 25 December. The last tour leaves when the ticket office closes.

It’s humid inside, so wear shoes with grip and bring a light layer in summer. There’s an uncovered 300-metre walk back from the lift exit, so bring a coat or umbrella on a wet day (umbrellas aren’t allowed inside the cave). Only water is allowed underground: no food or chewing gum. Don’t touch the formations, and stay behind the railings. Photos are fine.

Pets can come on the tour if the rest of the group agrees. There are toilets at the start and end, including adapted toilets and a baby-changing room, and a restaurant on site. For anyone who can’t manage the steps, the caves offer a virtual visit.

The Serra de Aire dinosaur footprints, near Fátima, are in the same limestone hills and make a good second stop. Cave fans can compare this with the Grutas da Moeda or the Grutas de Santo António and Alvados. For real caving with mud and an underground river, older children can try the Gruta do Soprador do Carvalho near Penela.

How many steps are there in the Mira de Aire caves?

683 steps, all going down. A lift brings you back up at the end.

Can you take a buggy into the Grutas de Mira de Aire?

No. Buggies can’t be used on the tour, so bring a sling or carrier.

Do you need to book?

Not for families. Tours leave as people arrive, usually within 30 minutes. Groups of 20 or more adults and schools must book in writing.

Is there a tour in English?

The guide speaks Portuguese, but the free app has an English audio guide and a children’s version.

What’s the minimum age for the 5 Senses tour?

12 years. It takes two hours, must be booked four days ahead and cost €33 a person in 2026.

How long does the visit take?

About an hour underground, plus time for the animals and gardens outside.