The Hospital de la Santa Creu i Sant Pau is a stunning architectural masterpiece that has transitioned from a bustling healthcare facility to a remarkable site open for visitors. Originally serving as a hospital, the inpatient wards and most outpatient services have since moved to the new Nou Hospital building.
Exploring this historic site is now more accessible, allowing visitors to fully appreciate its intricate designs and historical significance. Among its intriguing features is a network of underground passages. These hidden corridors, once used for the hospital's operations, still house small carriages. Visitors can access these passages near the WCs located at the central square, nestled between the Banc de Sang and Quiròfans.
Source - https://en.wikipedia.org/wiki/Hospital_de_Sant_Pau