Barcelona is an enchanting seaside city with boundless culture, fabled architecture and a world-class drinking and dining scene. Barcelona's architectural treasures span 2000-plus years. Towering temple columns, ancient city walls and subterranean stone corridors provide a window into Roman-era Barcino. Fast forward a thousand years or so to the Middle Ages by taking a stroll through the shadowy lanes of the Gothic quarter, past tranquil plazas and soaring 14th-century cathedrals.