The Lost City Trek
This is the best, and most treacherous hike, in Colombia, if not the whole of South America. It’s an adventurous trail that’ll take you over river crossings, steep stone steps, and through beautiful, lush jungle. The entire trek takes you to Cuidad Perdida, which is The Lost City, founded 650 years before Machu Picchu. Even though it’s challenging, it’s mind blowing. You’ll probably encounter wildlife and insects you’ve never seen before. Be careful and watch out for snakes and poisonous insects, which is partly why it’s so dangerous (Wanderlulu).