Colorado is full of reminders of the past, many of which have origins that date back further than any living human.

Read More: Colorado's Home to One of the Largest Collegiate Letters on Earth |

The Centennial State is also home to many record holders for being the largest, the oldest, and due to the state's notably high altitude, the highest.

However, one Colorado landmark that was named by Ripley's Believe it or Not as the largest of its kind is far less popular than, say, Betty Ford Alpine Gardens, (the highest botanical gardens,) but certainly earns a page in the state's history books.

Cobblestone Building in Golden Colorado Named the Largest

Since 1913, a large building made of cobblestones resembling a castle has sat at 1301 Arapahoe Street in Golden, Colorado, and has served a variety of purposes.

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Known today as the National Guard Armory, the building originally served as an actual armory for troops during the Colorado Coalfield War but was later converted into a partial rental space, an emergency makeshift hospital for the Red Cross during the influenza pandemic of 1918, an auditorium, and more.

Today, the building serves multiple purposes including housing for students attending the nearby Colorado School of Mines, the only coworking spot in the city of Golden, and a popular coffee shop.

The National Guard Armory was added to the National Registry of Historic Places in 1978 and later named the largest cobblestone building in the United States by Ripley's Believe or Not.

The building was also briefly owned by actor Gene Hackman for a period of time.

Historic + Haunted: See Inside Denver Colorado’s Press Club

The Denver Press Club has a lot of history, much of which involved paranormal activity.

Gallery Credit: Nate Wilde

The Paradox Mines Are Historic + Dangerous Colorado Landmarks

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 of the historic mines in Paradox, Colorado, a historic area in which uranium mining took place in Colorado’s early days.

Gallery Credit: Nate Wilde

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