While the days of the mining boom that brought settlers to the area that would eventually become known as Colorado seem like an eternity ago, there are plenty of examples of this historic time period still standing.

These relics of the state's past come in the form of ghost towns, abandoned mines, and a plethora of old tunnels that are still intact today.

Read More: Colorado's Creepy Tunnel: A Dark History Of Tragedy And Ghosts |

One of these tunnels carries quite a bit of significance with relation to Colorado's past as it was once considered the highest railroad tunnel in North America as well as the first of its kind to cross the Continental Divide via the Centennial State.

Historic Colorado Alpine Tunnel + its Story

The Alpine Tunnel was originally built as a means to transport miners, equipment, and minerals to and from Gunnison, Colorado back in 1880.

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The tunnel was completed in 1882, roughly a year after the projected date to be finished, by over 400 workers who faced adversity via especially brutal winter conditions.

At the time, it was the most expensive railroad tunnel to have ever been built in the United States. It measured 1,772 feet in length and cost roughly $300,000 to complete.

However, due to numerous accidents and other factors, the tunnel would be closed and abandoned by 1910, leaving it to collapse and become a thing of legend eventually.

The site of one of the Alpine Tunnel's entrances has since been restored by volunteers and is open to the public during summer months, but the tunnel itself remains buried beneath the ground.

Keep scrolling to check out what the site of Colorado's historic Alpine Tunnel looks  like today:

Collapsed + Abandoned: Historic Former Colorado Tunnel’s Story

While Colorado’s Alpine Tunnel has been abandoned for many years, the site in which it was built is still around and it carries a fascinating backstory.

Gallery Credit: Nate Wilde

LOOK: Seven Lost Tunnels Along an Abandoned Colorado Railway

WARNING: Under no circumstances should you enter this property. By doing so you risk bodily harm and/or prosecution for trespassing on private property.

Take a virtual tour through seven abandoned tunnels along a forgotten train route from Manitou Springs to Leadville, Colorado.

Gallery Credit: Nate Wilde

Colorado’s Secret Zombie Tunnel will Make your Skin Crawl

WARNING: Under no circumstances should you enter this property. By doing so you risk bodily harm and/or prosecution for trespassing on private property.

They say that there are over 70 zombies painted in what is known by some as Colorado’s zombie tunnel.

Gallery Credit: Nate Wilde

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