There are around 600 caves in the state of Colorado according to the Colorado Grotto. There are a few that nobody should go in and at least one that should never be explored by anyone.

Death by stench sounds awful. One Colorado cave is so toxic that just going long enough to take 1 or breaths could result in serious illness. Keep going to take a look at Colorado's Sulphur Cave.

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Where is Colorado's Sulphur Cave?

Colorado's Sulphur Cave is on land owned by the city of Steamboat Springs. The Sulphur Cave and Springs are found near the popular Howelsen Ski Area located south of the river not far from Lincoln Avenue. Sulphur Cave is about 25 feet deep and about 200 feet long.

Why is Colorado's Sulphur Cave So Dangerous?

Entry into Sulphur Cave is strictly prohibited by the city of Steamboat Springs. Toxic gasses will cause sickness, severe illness, passing out, and even death. Experts at the Denver Museum of Nature and Science say the gasses inside include hydrogen sulfide and carbon dioxide. Both can cause nasty side effects after only a couple of breaths. This smelly Colorado cave oozes acid strong enough to burn right through your clothes. 

A Natural National Landmark?

Despite the toxic environment for humans. other creatures are thriving inside. Spiders, millipedes, beetles, and a brand new discovery could be the reason this cave ends up as a National Natural Landmark. Tap the video from 9News to take a look at the creepy blood-red worms found in Sulphur Cave.

LOOK: The Now-Abandoned Old Exit of Colorado's Cave of the Winds

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

Popular Colorado attraction Cave of the Winds has an exit that is no longer in use and is now completely abandoned.

SAY WHAT: Check Out Colorado's Bum Butt Cave

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

There is a cave in Colorado with the graffiti of "Bum Butt Cave" written on it:

MORE: Colorado's Longest Cave is Also One of the Largest in the Country

See inside Colorado's largest and longest cave - Groaning Cave. Discovered in 1968, this cave system stretches out over 15 miles of surveyed tunnels. Permits are given to experienced cavers only to explore this wonder inside Colorado's White River National Forest.

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