The Reina Sofia museum was originally a hospital that was redesigned and converted into one of the world's leading modern art museums. From the breathtaking architecture outside of the building to the beautiful glass elevators, you'll be impressed before you even step inside. Once you go through the doors you can see a huge collection of works that inspired movements, including many from Salvador Dalí and Picasso. The museum's most famous piece is Picasso's "El Guernica" which leaves a lasting impression considering its theme and sheer size. The museum is a must-see even for Budget Travellers as some days there is free entry!