Families traveling with young children may want to take a break from Spain's historic marvels to visit a place where kids can explore the wonders of science. 

This large science discovery complex, about a 15-minute walk from the center, includes a Macroscopio Pavilion that explores the Human Body, the Techno-Forum Pavilion that examines new technologies, and several other pavilions with exhibits that include such kid-pleasers as a Tunnel of Infinity, where their reflection is multiplied into infinity. 

There's a planetarium that projects 7,000 stars, a tropical butterfly garden, and outdoor exhibit areas that explore botany, mechanics, perception, energy and more.