You have heard of the lost world of Atlantis, the Lost Continent (Roanoke Island, North Carolina), and the tragic Pompeii, but did you know that Colorado is home to a lost town of its own? No, we do not mean a ghost town (though we have 1,500 of those), but rather a Colorado community that has flat out disappeared:

Located south of Breckenridge near the tiny community of Alma lies the grandiose Montgomery Reservoir, which is home to ample fishing, hiking, and ATV trails, and... an underwater town?!
TripAdvisor/Shun01
Believe it or not, Montgomery Reservoir sits atop the former town of Montgomery, a once up-and-coming mining town that was a place to call home for Gold Rush miners and their families.
TripAdvisor/Shun01
At its peak, Montgomery was home to not only 1,000+ residents but also 150 cabins, a dance hall and saloon, a hotel, and more. 
TripAdvisor/AcP

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Like many other old Colorado mining towns, when the mines began to dry, so did the interest in the community, which caused the community to fold by the 1890s and become virtually deserted.
Google/Donna Finley
While many old towns sit eerie and deserted, Montgomery would experience a different fate, as the land both in and around the town was sold to the City of Colorado Springs, who flooded the ghost town and converted it into the aptly-named Montgomery Reservoir.
TripAdvisor/AcP
While most of the town is long gone, some remnants are still seen from the Reservoir's past life, including the Magnolia Mill (pictured).
TripAdvisor/Shun01
Please note: While the area is open year-round, it is best accessible from May through October. If you visit during colder months, please be cautious of deep snow and ice. 
Google/Charles Reeves

Do you have a favorite attraction that you would like to see featured on Only in Colorado? Nominate it here! For even more incredible Centennial State ghost towns, take This Haunting Road Trip Through Colorado Ghost Towns Is One You Won’t Forget.

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Montgomery Reservoir, Colorado 80424, USA