Begin your adventure with a journey to the Prohodna Cave, also known as the "Eyes of God." Walk through the giant limestone arches and witness the famous holes in the ceiling that look like giant eyes staring down at you.

Next, pass by the impressive Shipka Memorial as you head into the mountains. Take in the soaring views and learn about the history of the region.

Finally, reach the highlight of the trip, the Buzludzha Monument. Perched atop a mountain peak, this iconic "UFO-shaped" structure is one of the most famous abandoned sites in the world. Walk around, soak in the rugged mountain scenery, and get those epic, once-in-a-lifetime photos.

Note: For safety reasons, the interior of the Buzludzha monument is strictly closed and forbidden to enter, but the exterior and the surrounding panoramic views are absolutely spectacular.