Las Caldas Valle

Oviedo, Municipality of Oviedo, Spain, Spain

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Las Caldas Valle is a historic thermal spa valley complex just outside Oviedo in Asturias, Spain, renowned for its mineral-rich waters harnessed since Roman times but formally developed in 1776 as Balneario Las Caldas with neoclassical architecture by Ventura Rodríguez.

Expanded in the 19th century under the González Alegre family with additions like the iconic Hall of Mirrors and a glass gallery bridge, it became Europe's premier wellness retreat treating ailments through hydrotherapy amid romantic gardens and bathing houses.

Revitalized in 2008 as the five-star Blau Gran Hotel Las Caldas and Balneario Real—preserving original structures like El Manantial—this adults-only haven blends 250 years of spa heritage with modern Aquaxana circuits, saunas, and treatments drawing on calcium-magnesium waters for relaxation near prehistoric Las Caldas Cave.