You are standing in one of the most evocative spaces in Barcelona. High above you, the soaring iron and glass arches of the old Mercat del Born create a sense of airy grandeur, but the real soul of this place lies directly beneath your feet. This is the El Born Cultural and Memorial Center, a site where the nineteenth and eighteenth centuries exist in a unique, almost impossible tension. In the early two thousands, while the city was preparing to turn this former marketplace into a library, they hit stone—and not just any stone. They discovered a perfectly preserved archaeological site that forced the city to stop, rethink, and preserve one of the largest early modern excavations in Europe. As you look down from the glass walkways, you are not just looking at ruins; you are looking at a neighborhood that was frozen in time for nearly three hundred years. Get ready to walk through a doorway into the lost city of Barcelona.