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An old abandoned mine located near the Salmon Glacier in northern British Columbia.

Olvera Tunnel at Via Verde de la Sierra greenway - Olvera, Andalusia, Spain

Old railway passing through short tunnels in picturesque rural scenery

Detail of the entrance to the Chubut central railway tunnel in Gaiman, today it is out of operation Patagonia Argentina

Beautiful View Of The Old Historic Last Chance Silver Mine Just Outside Creede, Colorado

Double tunnels on snow covered dirt road through 11 mile canyon near Lake George, Colorado west of Colorado Springs, USA, North America.

Old train tunnel with railway in a mountain

Entrance opening hole of dark black natural water tunnel at Broken River Cave Stream Reserve, Canterbury South Island New Zealand

Los Alamos, NM: View Toward Santa Fe, Rio Grande River

Prescott, Arizona, USA - March 5, 2015: Cars stopped at traffic light traveling on Highway 69 in Prescott, Arizona with mountains in background

The Stockholm metro (Subway or Tunnelbana) has been called the longest art gallery in the world

Rustical wooden bridge over mountain river. Juuku gorge, Issyk-Kul region

The bottom of a water fall in Tallulah Falls Gorge

Gros Ventre River Bridge near Jackson Hole in Teton County, Wyoming

a tunnel hike access mountain hiking trail adventure underneath road walkway pathway trek

Panoramic Views of Yosemite National Park

The King's little pathway, walkway along the steep walls, narrow gorge in El Chorro, Ardales

Potrerillos Dam, road coming from the border with Chile and tunnel, in the Andes mountain range. Mendoza Province, Argentina.

The Via Verde trail is a beautiful route through sections of Andalusia, Spain. It is a multi-use trail, often travelled on foot or on bicycle. The section of the train near Olvera has a very large number of tunnels, some illuminated, others not. This trail was created on an old rail link that was never even travelled by trains because work was interrupted by the civil war. This view shows the entrance of a rather short tunnel.

Entrance into a road tunnel is captured in Norway on a summer day. The road in the tunnel is illuminated and is surrounded by concrete blocks.

Arthur Seat Mountain, also known as Art's Ass, stands in the Clear Range of the Interior Plateau. Foreground shows the Thompson River viewed from the Trans-Canada Highway at Spences Bridge. Autumn midday in the Thompson-Nicola Regional District.

$Sima de San Pedro is located in Spain, within the autonomous community of Aragon, a region characterized by aridity and extreme temperatures. It is a chasm of karst origin, with a mouth of about 100 meters in diameter and a depth of 108, It is considered unique in Europe thanks to its complex and rich geological structure. Right at the bottom of the pit lies a lake that is 22 meters deep and contains 560,000 cubic meters of water.\n\nThis natural beauty is known as one of the most unique and important ecosystems in the region. Its interior is formed by an exceptional example of a microclimate that hosts over 25 species of vertebrates, including amphibians, reptiles, birds and mammals, as well as important colonies of bats. The Sima de San Pedro, or the Voragine di Saint Peter, is located near Oliete, a small townThe photo is taken from the edge of a deep sinkhole in the karst scenery of the Aragon area of Spain. The view looks directly to the edge and cliff face of the chasm but also shows some of the land above it. The sky is blue.\n\nThe sinkhole is called Sima de San Pedro is located in Aragon, Spain. It is a chasm of karst origin, with a mouth of about 100 meters in diameter and a depth of 108, It is considered unique in Europe thanks to its complex and rich geological structure. Right at the bottom of the pit lies a lake that is 22 meters deep and contains 560,000 cubic meters of water.\n\nIt is a unique and important ecosystems in the region. Its interior contains a microclimate that hosts over 25 species of vertebrates, including amphibians, reptiles, birds and mammals, as well as important colonies of bats. The Sima de San Pedro, or the Voragine di Saint Peter, is located near Oliete, a small town$

Chapman's Peak Drive was hacked out of the face of the mountain between 1915 and 1922. Now it´s a famous toll road for tourists all over the world.

One of the greatest Engineering feats of British rule in India was to lay a railway track through the famous Bolan Pass. More than a century old, this railway track still generates an awe among rail enthusiasts all over the world.

Wildlife passage in the Madrid-Levante High-Speed Railway

Old dirt road wooden and steel bridge over the Musselshell River in central Montana.

Free Images: "bestof:Tunnel connecting volcano creek and south fork of Kern, the latter shown in the foreground.jpeg Tunnel connecting volcano creek and south fork of C Kern River"

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