"Schutzhütte Zollikon", grill/bbq available. Access: 600m gravel road.

In the heart of pine forests, in the Sierra de Urbión Natural Area.

Spacious, with a capacity for 8-10 people, fireplace, table, chairs and a small porch.

It can be accessed via the GR 86.1, a hiking route, or by a forest track in good condition.

Good location to access the viewpoint of Laguna Negra and Urbión.

*There is a fountain nearby, but it is usually dry.

Close to Loarre Castle, access is via very good mountain bike and gravel tracks.
A very well kept free shelter with a fireplace, a long table and even cooking utensils.
It does not have a bed.

Pequeño refugio para dos o tres personas con chimenea y fuente cerca

También tiene fuente, pero dudo que esté operativa en algún momento.

Refugio libre situado en una collada por donde pasa una cabañera,  junto a una ermita con el mismo nombre.

Posibilidad de tomar agua en el pueblo de Estaña.

About 12km from Biel is this shelter right on the slopes, with easy access for gravel and mountain bike.
It has a picnic area outside and a fireplace inside and a large table to eat (I slept at the
table).
It has a second loft-style floor with more space to sleep.
Quite clean.

Refugio libre en la parte final de la mítica pista de Liena (valle del río Real, en el Sobrarbe)

Uno de los puertos más duros de Aragón y la cima Coppi de la comunidad (a la que puedes llegar pedaleando)

Uno de los sitios a los que se va de propio (auténtico paraíso)

Refugio de cazadores libre, entre los municipios de María de Huerva y el barrio del Alto de la Muela. Lugar muy tranquilo.

In the Barranco de la Hoz, going up from Vallada towards Ayora, in the heart of the Enguera mountain range, there is this small shelter, a little off the track but very close to it and well signposted. The times I have been there, it is in perfect condition and clean enough to spend a night inside.