Most visitors walk straight past it on their way to the Sagrada Família. That's a mistake.
The Hospital de la Santa Creu i Sant Pau — Hospital of the Holy Cross and Saint Paul — is one of the most stunning architectural complexes in the city, and it still doesn't make it onto most tourist itineraries. If you've spent time with Catalan Modernisme and find yourself wanting more, this is your next stop. It's a ten minute walk from the Sagrada Família. There really is no excuse to skip it.