With its vast Roman remains, walls, and fortifications and its medieval Christian monuments, Tarragona has been designated a UNESCO World Heritage Site. The city today is a vibrant center of culture and arts, a busy fishing and shipping port, and a natural jumping-off point for the towns and pristine beaches of the Costa Daurada, 216 km (134 miles) of coastline north of the Costa del Azahar.
Though modern Tarragona is very much an industrial and commercial city, it has preserved its heritage superbly. Stroll along the town's cliff-side perimeter and you'll see why the Romans set up shop here: Tarragona is strategically positioned at the center of a broad, open bay, with an unobstructed view of the sea. As capital of the Roman province of Hispania Tarraconensis (from 218 BC), Tarraco (as it was then called) formed the empire's principal stronghold in Spain. St. Paul preached here in AD 58, and Tarragona became the seat of the Christian church in Spain until it was superseded by Toledo in the 11th century.
Entering the city from Barcelona, you'll pass the Triumphal Arch of Berà, dating from the 3rd century BC, 19 km (12 miles) north of Tarragona; and from the Lleida (Lérida) autopista, you can see the 1st-century Roman aqueduct that helped carry fresh water 32 km (20 miles) from the Gaià River. Tarragona is divided clearly into old and new by Rambla Vella; the Old Town and most of the Roman remains are to the north, while modern Tarragona spreads out to the south. You could start your visit at acacia-lined Rambla Nova, at the end of which is a balcony overlooking the sea, the Balcó del Mediterràni. Then walk uphill along Passeig de les Palmeres; below it is the ancient amphitheater, the curve of which is echoed in the modern, semicircular Imperial Tarraco hotel on the promenade.