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Smoke at the exit to a tunnel after a steam engine has been through it.

Fairfax Station, Virginia, USA - March 14, 2024: Active railroad tracks pass over the so-called “Bunnyman Bridge” at the Colchester Overpass in Fairfax County.

Salzberg of the famous town of Hallstatt on Lake Hallstatt - in the picture the Franz Josef mine tunnels

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

A beautiful day in the medieval city of Wurzburg on a rainy day.

Medieval door with lion head door knocker.

Eerie looking door

A cave entrance in a beautiful forest in summer

Old tunnel of Lake Biwa Canal in Kyoto, Japan

Litthle sping in the hill near Lillafured village, hungary

Lock 33 of the C&O Canal is located across from Harpers Ferry at the base of Maryland Heights, with its old lockhouse once housing the Salty Dog Tavern, the ruins of which are pictured here - Harpers Ferry National Historical Park

Ingresso e uscita del rifugio antiaereo della Seconda Guerra Mondiale di Nera Montoro in Umbria

Abandoned tunnel entrance in Fort Point, San Francisco, California

Couple visiting the Bavarian Country

abandoned railroad tunnel

Underground Crypt

old tunnel excavated in the rock

Fast falling clean mountain water in a river bed.

Concrete block and rusted fences of the entrance to an abandoned mine in the mountain. Altai, Siberia, Russia.

Train Tracks going underground in Hamilton, Ontario

Jachymov - Mining adit number 1 - mining museum, a reminder of silver and uranium mining in Ore Mountains/Erzgebirge, Bohemia, Czech Republic. It is Mining Region of UNESCO World Heritage

An old weathered door in a recently cleared damaged stone garden wall

A view from the historical coal tunnels in Zonguldak, Turkey

Shelter used in case to bad weather, ie tornado

close up of old dungeon

The Jungfrau Railway is the highest railway line in Europe. It is situated in the UNESCO World Natural Heritage Swiss Alps Jungfrau-Aletsch region. Connecting Kleine Scheidegg in the Bernese Oberland to Jungfraujoch it takes you through stunning Alpine scenery to the top of Europe, making it one of the most beautiful ways to reach the summit. Learn more about this incredible feat of engineering and plan your visit to experience this must-visit attraction in Switzerland.

Concrete door in a mountain - Bunker in the mountain

An image of Castletown in Derbyshire, capturing the essence of this charming English village, notable not only for its historic buildings and scenic paths but also for its proximity to the unique natural landmark known as the Devil's Arse (also known as Peak Cavern). This remarkable cave entrance, set against the backdrop of the Peak District's stunning landscapes, adds an intriguing aspect to the tranquil beauty and historic charm of Castletown, embodying the diverse natural and cultural heritage of rural Derbyshire.

underground, mining, transportation,

Kaldbaksbotnur, Streymoy Island, Faroe Islands: Kollafjarðartunnilin car tunnel between Kollafjørður and Kaldbaksbotnur (completed in 1992), south entrance - the main route from Tórshavn to the villages in the north of the island. The Faroe islands are famous for their long tunnels.

Free Images: "bestof:Headwalls and door at Big Spring (Walker 1888).jpg Headwalls and door at Big Spring Sudbrook Severn Tunnel construction Original Thomas A Walker 1888 The Severn"

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