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An abandoned railway tunnel located under the Mały Wołowiec mountain (720 m a.s.l.) in the southeastern part of the Wałbrzyskie Mountains, between the towns of Wałbrzych and Jedlina-Zdrój, southwest Poland.
The Trent and Mersey Canal and northern entrance to both Harecastle Tunnels, Kidsgrove, Newcastle-under-Lyme. The water is orange because if clay deposited in the Harecastle Tunnel, landscape
Path among in Adrspach - Teplice Rocks in Czech Republic
Golden Bay, New Zealand
A trail leads un an rocky overhang at Lower North Falls in Silver Falls State Park in Oregon State.
Water fall between large rocks covered in moss in dense rainforest environment
A panorama landscape view of Cheddar Gorge in the Mendip Hills near Cheddar in Somerset
Stock photograph of the Historic Entrance at Mammoth Cave National Park in Kentucky, USA
Limestone scenery at Malham Cove with Balham Beck in the foreground, Yorkshire Dales, UK
Gilfenklamm gorge. Racines. Autonomous Province of Bolzano. Trentino-Alto Adige. Italy.
Tranquil rock and it's reflecting on water in Son Doong Cave, the largest cave in the world, is in the heart of the Phong Nha Ke Bang National Park in the Quang Binh province
Waterfall and meltwater river in the valley approaching Briksdal Glacier in Norway.
Scarisoara, Romania - August 12, 2015: Unidentified tourists visiting the Scarisoara ice cave, the largest ice cave from Europe
Rocks and water flow under the riverbed
The Seisenbergklamm is a 600m long Gorge near Weißbach, Austria
Fiordland National Park. New Zealand.
Cave church, panorama from man-made caves, Lesnovo, Macedonia. In the peaks of mountain near monastery complex there are a number of man-made caves, and commemorative plaques.
Woman hiking outdoors. Adventures in summer Norway, in the Bergen area.
Huel Lee or Hohllay on the Mullerthal trail in Luxembourg, open cave with view to the forest, sandstone rock formation
caption of a stone wall above a river
An old water diversion tunnel along a river.
The entrance to the impressive ice cave in Scarisoara, in the Transylvania region of Romania. The cave is located at an altitude of 1165 metres above sea level. It is 105 m deep and 720 m long, and the entrance shaft (60 m in diameter and 48 m in depth) gives access through metal stairs to a large chamber, (108 m long, 78 m wide) - The Big Hall. From this point three openings lead to The Church (in front, with over 100 stalagmites), Great Reservation, Coman Gallery and Little Reservation (right). The part that tourists can visit includes the entrance shaft, The Big Hall and The Church, the other chambers,which can be visited only with the agreement of the Speological Institute of Cluj-Napoca, being reserved for scientists. The glacier has a volume of 75000 cubic metres and has average thickness of 16m. The glacier is reflected in the frozen lake inside the cave. Horizontal colour image with copy space.
Inside of the Fallen Monarch in the General Grant Tree loop in the Sequoia and Kings Canyon National Park.
Ontario, Canada.
A cliff hangs over that trail at South Falls in Silver Falls State Park in Oregon State.
Autumn in Watkins Glen State Park, near Seneca Lake, New York State, USA.
Entrance of a cave in the forest
Nature Photos of the “flat” top of  Table Mountain - Cape Town, Western Cape
A naturalistic wild attraction in the Monti Sibillini National Park, Marche region, province of Fermo
Madeira, hiking along irrigation channel (Levada)
Free Images: "bestof:FridlanderBastion.jpg en Fridlander underground bastion in the South Park of Kaliningrad ru Ров и стена подземелья Ф� идландского"
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