The Lost City was not truly lost as is true with most of the indigenous ruins around Central and South America, just abandoned and overgrown. The local indigenous populations were still well aware of its existence. The city was built around 800 by the Tayrona and abandoned in the 1500's when the population was decimated by conflict and disease after interaction with early European settlers. Today, there are four groups of indigenous populations, descended from the Tayrona, who inhabit the Sierra Nevada de Santa Marta mountains. Here is the wikipedia link for a little more history: https://en.wikipedia.org/wiki/Ciudad_Perdida
The only way to reach La Ciudad Perdida is by foot (or mule) with one of the four sanctioned tour companies. It is a challenging hike, but made very comfortable by great guides, all food provided, beds with full mosquito netting and the ability to refill water along the way. Now, that isn't to say we weren't completely eaten up by bugs anyway and many in our group experienced stomach issues the last couple days as well.
We loved the group we were matched with; 4 Dutch, 2 English, 1 Aussie, 2 Colombian, 2 Czech, 2 Canadian and 2 other Americans. All but the Czech and Colombians spoke English and almost everyone had passable Spanish, so we managed communication quite well. Kaylee was a social butterfly who bopped around throughout the days, partnering up with whoever happened to be in the front of the pack. She was always waiting for us at the next stop. The group mascot, everyone was really sweet with her. She did an awesome job, we were very proud of her, covering the 30+ miles with a small pack and great attitude. The guides kept asking, 'she's really only 8?'