Grutas de Cristal

Grutas de Cristal (the Crystal Caves) form an underground cave system near the small town of Molinos, in the province of Teruel, Aragon. The site holds Natural Monument status and ranks among the standout attractions of the Maestrazgo region.

Where exactly is it, and what should you expect?

The cave sits less than 4 kilometers from central Molinos, along a road leading into the surrounding hills. Inside, the temperature holds steady at around 12°C year-round, so a light jacket is worth packing regardless of the season outside. Guided visits last roughly an hour and wind through a network of small chambers linked by short galleries.

Why the "crystal" name?

The name isn't marketing fluff. The cave holds a dense collection of speleothems — stalactites, stalagmites, columns, and drapery-like curtain formations — that catch the lamplight in different shades and gleam like crystal. It's the sheer density and variety of these formations that sets Grutas de Cristal apart from many other caves in the area.

How was the cave discovered?

The cave was discovered in April 1961. A group of speleologists from the Puigmal Ski Club in Barcelona reached the interior with help from local residents, who knew the terrain and helped pinpoint the entrance. Systematic exploration and preparation for tourist access followed in the years after.

What archaeological find was made inside?

Excavations inside the cave uncovered remains known as the "Man of Molinos" (Hombre de Molinos) — a burial considered one of the oldest hominin finds in Aragon, dated to roughly 25,000 years ago. That discovery gave the cave archaeological significance on top of its geological interest, and the finds are now displayed in a local museum.

How much does admission cost?

Standard adult admission is 9 euros. Children up to 12 years old pay 5 euros. Prices can change, so it's worth confirming the current rate at the tourist office in Molinos before visiting.

Who is this attraction suited for?

The visit works reasonably well for families, though steps and uneven ground inside the cave make it a difficult option for visitors with limited mobility. The constant low temperature also means this isn't a spot to seek out warmth in summer — if anything, the cave's coolness is a welcome bonus on a hot day.

Frequently Asked Questions

How far is the cave from Molinos? Grutas de Cristal lies less than 4 kilometers from the center of Molinos.

How long does a visit take? A standard guided tour lasts about one hour.

Is it cold inside the cave? Yes, the interior temperature stays around 12°C year-round, regardless of the weather outside.

What was found inside the cave? Remains known as the "Man of Molinos" — a burial dated to roughly 25,000 years ago, one of the oldest hominin finds in the Aragon region.