The cave was discovered by accident in 1947 by local residents.
The internal temperature remains a constant 17 degrees Celsius throughout the year.
It contains a natural, multi-level 'fossil' gallery system spanning several geological periods.
The cave is part of the Serras de Aire e Candeeiros Natural Park, a protected limestone landscape.
Some chambers feature complex dripstone formations, including stalactites, stalagmites, and flowstones.
Mira de Aire Cave is the largest surveyed cave system in Portugal, extending over 11 kilometers in total. The tour covers a 600-meter route descending 110 meters underground into the limestone massif. The system features a series of massive chambers, including the Grande Sala, which measures 60 meters in height. Visitors descend through a natural formation that concludes at a subterranean river and lake. The cave is equipped with an elevator system that assists with the return ascent. It is recognized as one of the Seven Natural Wonders of Portugal due to its unique geological formations.
The viewing platform overlooking the Grande Sala offers the most comprehensive perspective of the cavern's scale.
Wear footwear with high-traction soles as the paths can be humid and slippery.
Bring a light jacket as the interior temperature is significantly cooler than the exterior, especially in summer.
Use the provided elevator for the ascent if you have limited mobility, as the walk back up involves many steps.
Attempting to photograph the entire space with a phone flash, which is ineffective in large chambers; prioritize stable footing over wide-angle shots.
Open daily throughout the year, though operating hours may be reduced during the winter months.
Do not touch the rock formations, as oils from human skin can disrupt their delicate mineral development.
