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Gold - old roman tunnel in gold mine Rosia Montana, Transylvania, Romania

Akhshtyrskaya cave is a landmark near the city of Sochi, Russia. 27 October 2019.

Iron Gates is a gorge on the Danube River, forming part of the boundary between Serbia and Romania

Russian north. The canyon is flooded with water - Ruskeala Park. Gorta, the ancient epic kalevala, landscapes

Russian north. The canyon is flooded with water - Ruskeala Park. Gorta, the ancient epic kalevala, landscapes

Granite rock formations in the Maggia river in the Maggia Valley or Valle Maggia, Tegna - Canton of Ticino, Switzerland

Wat Tum Khao Chakan temple in the mountains cave in Thailand.

Hole vacated in rocky place by erosion in waves

Rocky coastline of the atlantic ocean in Brufjellhalene, Norway, a popular travel destination for hiking and climbing.

Mountain in the Basque Country

Mountain in the Basque Country

Ear of dionysus and Cave of the Nymphaeum (Grotta del Ninfeo) artificial cave on Greek Roman theater in Syracuse, Italy

View down a water filled shaft down a open pit mine on the Swedish countryside with sharp rock edges and blue water

Russian north. The canyon is flooded with water - Ruskeala Park. Gorta, the ancient epic kalevala, landscapes

Beautiful view of the forest

A cave deep underground passage with light

Vik, Iceland, June 11, 2018. Hjorleifshofdi cave, Iceland on June 11, 2018.

Natural phenomenon of an arch in the mountain

Russian north. The canyon is flooded with water - Ruskeala Park. Gorta, the ancient epic kalevala, landscapes

Sun beam in cave

Sun beam in cave

Nature rocks cave stone stone mountain nature

Exit of a cave in the mountain of Pisac - Cusco in Peru

Bacho Kiro cave in Bulgaria

Canyon and gorge of the river Rak in the Skocjan Caves Park (UNESCO World Heritage) - Divaca, Slovenia

Mondmilchloch limestone cave with water source in the Swiss mountain range of Pilatus and in the Emmental Alps, Alpnach - Canton of Obwalden, Switzerland (Kanton Obwalden, Schweiz)

Hike through the Bittelschiesser valley with many caves and the historic Hornstein castle ruins in the Laucherttal near Sigmaringen

Interior detail of an ancient cave - Stopica cave - Zlatibor mountain, Serbia - suitable as a background

Iron Gates is a gorge on the Danube River, forming part of the boundary between Serbia and Romania

Gorge Rakov Skocjan Valley (Rakek or Notranjski regijski park Rakov Skocjan), Notranjska Regional landscape park Rakov Skocjan - Cerknica, Slovenia (Slovenija)

View inside saklikent canyon turkey

Closeup of hole between rocks with green moss and selective focus

Lava tunnel near the Caldeira, Graciosa island, Azores. High quality photo

Russian north. The canyon is flooded with water - Ruskeala Park. Gorta, the ancient epic kalevala, landscapes

Russian north. The canyon is flooded with water - Ruskeala Park. Gorta, the ancient epic kalevala, landscapes

Small cave or grotto in mountain cliff, mountaineering and caving in rocks

Visit to the mammoth cave in the Chatyr-Dag mountain range of Crimea.

Beautiful cave. View from inside dark dungeon. Textured walls of cave. Background image of underground tunnel. Dampness inside cave. Light at end of tunnel.

The entrance to a dark cave among the rocks in the mountain.

U.S. wingsuit flier Jeb Corliss flies through the cave on Tianmen Mountain in Zhangjiajie, central Chinas Hunan province, 24 September 2011

Tunnels in the mountains of Garda lake in Italy

Gorge in Trummelbach falls, water fall in the mountain of Lauterbrunnen valley, District of Interlaken, Bern canton in Switzerland.

Green rainforest on ko lanta island in thailand

View into one of the caves during sightseeing rides around the island of Capri, Italy.

Adit in old abandoned limestone quarry Velka Amerika. Medieval tunnel adit exposed by modern mining in the 1950s.

Baar, Switzerland, April 29, 2023 Incredible fascinating rock formation inside the Hoellengrotten cave

Tall and big sequoias in beautiful sequoia national park

Portugal, Sintra, Quinta da Regaleira, Imperfect Well (Poco Imperfeito)

Abstraction of natural stone

Landscape of Thamluang cave in Thamluang Khunnam Nangnon National Park, Chiang Rai province.

Landscape of Thamluang cave in Thamluang Khunnam Nangnon National Park, Chiang Rai province.

Crevice in the rock. Narrow path through the majestic sandstone rock walls. Adrspach rock city, Czech Republic, Europe

Gallery in an abandoned old mine

The Eyes of God in Prohodna Cave, famous cave in Karlukovo, Bulgaria

Rocks and stones in the Swiss Uri Alps mountain massif, Melchtal - Canton of Obwald, Switzerland (Kanton Obwalden, Schweiz)

Surface of a cave

Rocky pit of former tin mine in czech ore mounteins

Dionysius ear , ancient greek prison called Latomie in Siracusa archaeological park, Italy

There are two round holes on the karst mountain wall that look like eyes. The Three Natural Bridges are a series of natural limestone bridges, Chongqing.

Tunnel in an old gold mine

The entrance of Unguru Mare cave, Apuseni Mountains, Occidental Carpathians, Transylvania, Romania, Europe

Picture with a sandstone wall and tree roots, a cave covered with moss and lichens

Walk the footbridge between the rocks near the cave in the national park.