Cartagena

Cartagena is Colombia's Caribbean jewel — population 1M, UNESCO World Heritage 1984 (the largest preserved Spanish colonial walled city in the Americas, founded 1533 by Pedro de Heredia). The Old Town (Ciudad Amurallada, 'Walled City') has 11km of stone fortifications + 8 watchtowers + colorful 16th-19th century facades + iconic balconies dripping with bougainvillea — the most photographed Latin American old town. Castillo San Felipe de Barajas (1657 Spanish fortress, largest in colonial Americas, defended Cartagena from English pirates including Sir Francis Drake), Las Bóvedas (former colonial dungeons turned souvenir shops), and Plaza Santo Domingo (with Botero's voluptuous bronze 'Reclining Woman' statue) anchor the experience.

Beyond Old Town: Getsemaní (the bohemian neighborhood that exploded after Colombia's safety improvements 2010s — vibrant street art + late-night salsa + hostels + cheaper boutique hotels), Rosario Islands (boat day trip + Caribbean snorkeling + Playa Blanca beach 1h south), and Bocagrande beach district (high-rises + Caribbean Sea similar to Miami Beach). Hot year-round (28-32°C) with breezy December-April dry season ideal. 2h flight from Bogotá or Medellín.

Iconic Caribbean Colombian cuisine: Ceviche (cevicheria La Cevichería was Bourdain's favorite, $15-25 — long lines), Arepa de huevo (corn cake stuffed with egg, $1-2), Patacones (twice-fried plantains, $5-8), Sancocho (chicken/beef stew, $8-15), Bandeja paisa (Colombia's national dish — beans + rice + chorizo + plantain + arepa + egg + ham + avocado, $10-18), Aguardiente anise liquor ($20-40 bottle), Café Colombia ($2-5).

Bottom line: Cartagena is canonical Colombian Caribbean + UNESCO walled city + most beautiful South American old town. 3-4 days hits Walled City + Rosario Islands + Getsemaní + Bocagrande beach.