Fields, greenhouses, and the suburbs of Antalya now surround what’s left of Perge, but dial back two millennia and you’d find a thriving Roman city. Alexander the Great marched through, and later the Romans took it over and built its baths, fountains, 200-foot-long square agora, 12,000-seat theater, and 60-foot-wide colonnaded boulevard. The site’s also known for its unusual circular stone gate-towers built in a combined Greek-and-Roman style—and for St. Paul’s two visits.