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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

One of the first tunnels to take trains through the mountains on the Allegheny Portage Railway in Pennsylvania

Canadian's first railway tunnel transformed into a footpath in Brockville during summer day

The Illinois Iron Furnace is the only remaining iron furnace structure in the state of Illinois. Iron was manufactured at the Illinois Furnace by the charcoal blast method. The exterior of the furnace was manufactured of large limestone blocks quarried near the town of Cave-In-Rock.

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Lighting reveals the stone block interior of one of three former train tunnels now used for the Elroy-Sparta State Recreation Trail near Sparta, WI.

Underground vaulted urban sewer tunnel with dirty sewage.

Underground old sewerage treatment plant tunel of the 19th century

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

Allegheny Portage Railroad National Historic Site

Concrete underpass tunnel in East Houston, Texas, features a railroad bridge overhead and corrugated retaining walls. The construction of flood level orange indicators on tunnel walls is essential for early warning during heavy rainfall. Driving plate

Traverse City, Michigan USA - August 30, 2023: An illuminated pedestrian tunnel lit for evening pedestrians walking in Traverse City Michigan.

$The entrance to the Paw Paw Tunnel on the Chesapeake and Ohio Canal in West Virginia. The tunnel is 3,118 ft. long and was completed in the mid 1800s.\n\nThe image is also largely symbolic with a pathway leading into darkness, the great unknown of what is to come as a person starts a new beginning in life.$

Bunny Man Bridge, near Clifton, Virginia is a local urban legend of supernatural ghostly happenings, in Fairfax County. Also known as Colchester Overpass

Austria, Kärnten, Klagenfurt. Historic stone bridge across the Lendkanal, 8th district “Villacher Vorstadt”. It was built in 1535 and is the oldest bridge over the Lend Canal.

On a cloudy day in early Autumn, a bike is parked beside warning signs near the entrance to a tunnel along the Great Allegheny Passage recreation trail in Pennsylvania.

Inside a cicular kiln in Mildenberg (Brandenburg, Germany).

The end of a tunnel leading to the lush, green outdoors.

Famous industrial revolution architecture on England wales border

Paris, France -- September 18, 2022: Canal Saint-Martin, weaves its way through the heart of the Paris. Stretching an impressive 4.6 kilometers (2.86 miles), this picturesque waterway serves as a vital connection between the Canal de l'Ourcq and the majestic river Seine. Along its course there are 9 locks, one of which is pictured here. A significant portion, approximately 2,069 meters (2,263 yards) long, had been concealed beneath the surface during the mid-19th century. The aim was to create expansive boulevards and inviting public spaces above, leaving only traces of the covered canal visible.

fallingroyd tunnel on the rochdale canal in hebden bridge built to carry the canal under the a58 road

Flooded tunnel of an old abandoned coal mine with rusty remnants of railroad.

Long dark tunnel with small light at the end

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