"Built around 800 CE and older than Machu Picchu, La Ciudad Perdida contains 169 terraces carved into the mountains plus a network of tiled roads and small plazas; it’s one of the most beautiful treks in the country. You must visit with a tour operator and expect 4–6 days (or a faster 3-day option) trekking from Santa Marta through jungle and many river crossings; tours typically cost about $400–600 USD and I advise bringing an extra pair of shoes or flip-flops for river crossings since sneakers get ruined." - Matthew Kepnes