The entrance to Madara cave - an ancient archeological site.

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Size: 4272px × 2856px
Location: Bulgaria
Photo credit: © Petar Paunchev / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: ancient, background, beautiful, big, bulgaria, cave, cavern, dark, deep, empty, entrance, exploration, geologic, geology, green, hole, karst, landmark, landscape, light, limestone, madara, mountain, mysterious, natural, nature, opening, rock, speleology, stone, thracian, tourism, travel, tree, tunnel, underground, view, wall