In this one compact space is a unique site that encompasses more than 17 centuries of civilization in Barcelona:

* ruins of the old Roman city of Barcino from the 1st century BC to the 3rd century AD;
* remnants of political and ecclesiastical
buildings from the Visigoth era (300-700 AD);
* medieval spaces, including the Chapel of
Santa Àgata, begun in 1302; and

The Barcino excavations are accessed via an
elaborate underground network of suspended glass walkways that float over and
alongside an impressive villa with gorgeous tile work and ancient workshops
devoted to the important activities of laundry and dyeing, fish salting, and
wine making.

Head up the incline to the left of the cathedral and then turn left into the "Viceroy's Palace," also known as the "Archives of the Crown of Aragon."
Total walking time: approximately 20 minutes . . . unless, of course, you stop to ooh and ahh!