Montaña de sal de Cardona

The Castle of Cardona is arguably the most important medieval fortress

Besora Castle is a castle located in the Vall de Lord, in the

Santa Maria de Montserrat is a Benedictine abbey located in the

The Aeri de Montserrat is an aerial cable car which provides one of

The Castle of Gallifa is found on the plain that accommodates Gallifa,

The Artigas Gardens (Catalan: Els Jardins de Can Artigas), in Lillet,

Monumental church complex of Sant Pere is a Bien de Interés Cultural

Terrassa Cathedral', or the Cathedral Basilica of the Holy Spirit

The Salt Cathedral of Zipaquirá (Spanish: Catedral de Sal de

Karaca Cave (Turkish: Karaca Mağarası) is a network of caves l

Batu Caves is a limestone hill, which has a series of caves and cave

Saeva dupka (Bulgarian: Съева дупка) is a cave in Northern Bulgaria

The Wieliczka Salt Mine, located in the town of Wieliczka in southern