Top 4 Caves ミネソタでの

At ground level where Minnehaha Creek meets the Mississippi River, the layer of rock you see is known as the St. Peter Sandstone. This rock formation is renowned for its "dazzling white" appearance—often likened to sugar because it is nearly 99% pure quartz—yet in the Mississippi River gorge, it often appears in vivid shades of yellow, orange, and rusty red. The vivid coloration you observe is not the inherent color of the sand but rather the effect of iron oxide (limonite) staining, which occurs through two distinct steps: Leaching: Water filters down through the overlying Platteville Limestone and Glenwood Shale, both of which contain iron-rich minerals. Oxidation: This mineral-laden water permeates the porous St. Peter Sandstone. As the dissolved iron is exposed at the cliff face or ground surface, it oxidizes (effectively "rusts"), coating the originally white quartz grains and producing the yellow and orange hues.

Now a dispensary and other businesses. Roets wanted to open here back in the day, but the ruins were not stable enough. I have seen videos online that you can still get into the brewery caves.

From the time when this was a part of the State Hospital and they would store their veggies and cheese in the cave for the winter.

Bruce Vento Nature Sanctuary in Saint Paul, is a tranquil urban oasis that offers a nice mix of natural beauty and historical significance. The 29 acres feature diverse ecosystems, including woodlands, wetlands, and native prairie areas. While hiking along the trails, you will spot multiple caves, ponds and remnants of the historic railroad structures.

The St. Croix Boom Site is a historic landmark that marks the place where logs were sorted and stored for the lumber industry from 1856 to 1914. Near the site, you can explore a cave that was once used by loggers and rivermen as a shelter and a storage place. The cave has a wooden door and a sign that reads "Boom Site Cave". Inside, you can see graffiti from past visitors and feel the cool air. The cave is a hidden gem for adventurous hikers who want to experience a bit of history and mystery.