Discover the charms of Colón, an historic city on the Caribbean Sea, during this full-day trip from Panama City. Board the Panama Canal Railway to cross the Isthmus of Panama, flanking the canal and traveling through the tropical forest. Visit the Gatun Locks, the entrance to the Panama Canal on the Atlantic side, and learn about the canal's operation through your guide's commentary. Stop for lunch (own expense), then continue to the ruins of Portobelo-San Lorenzo, built in the 17th- and 18th-century by the Spanish empire and designated a UNESCO World Heritage site. Hotel pickup and drop-off in Panama City are included.