With risks involving everything from toxic fumes to deadly heat, these natural attractions certainly aren't for
webpage the fainthearted.
DailyMail.com has scoured the globe for a collection of wonders which tourists are warned to approach with extreme caution.
Most recently, Costa Rica's Cave of Death or 'Cueva de la Muerte' made headlines with inquisitive tourists flocking to see the cavern which emits carbon dioxide and instantly kills any creature that enter.
But equally as toxic is the sulfur lake at the Kawah Ijen volcano in East Java, Indonesia, which would kill anyone if they fell in.
From caves to volcanoes to ice-capped mountains and spots in between, take a trip down to see the wonders you should be wary of.
Gates of Hell, Turkmenistan The Darvaza flaming gas crater in Turkmenistan has been burning for close to 50 yearsNicknamed the Gates of Hell, the Darvaza flaming gas crater in Turkmenistan is a sinkhole 100ft deep and 130ft wide, which formed when the Soviets were drilling for natural gas.
The upper layers of soil collapsed into an underground cave, opening a large hole filled with gas.
To avoid gas poisoning local people and livestock, geologists ignited it. They believed the fire would subside within weeks but the whole crater has been burning for close to 50 years.
In November 2013, it was found by Canadian explorer George Kourounis that unique bacteria survive at the bottom of the crater despite the roasting temperatures.
Kourounis was the expedition leader on behalf of National Geographic as part of a project which involved going inside the crater and gathering soil samples for DNA analysis.
This was to look for 'microscopic life forms that are capable of surviving in these intensely hot, dry conditions,' Kourounis explains. It took a year and a half of preparation and getting government permission.
To get into the crater, Kourounis and his team stretched fire-resistant ropes across the flaming pit and he was able to go out on the ropes, using pulleys and wearing a heat-protective suit with a self-contained air tank.
Then he had to rappel down to the bottom, where he had 17 minutes to collect his samples, take some temperature readings and get out safely.
Thousands of tourists also flock to the site every year to snap fiery photos from the sidelines. While the crater is one of Turkmenistan's main tourist attractions, it is also a cause of environmental blight with vast quantities of harmful methane released into the atmosphere.
Naica Crystal Cave, MexicoCave of the Crystals in Mexico were discovered by two miners looking for leadThe Cave of the Crystals in Mexico is connected to the Naica Mine, below the surface of Naica, Chihuahua, where explorers can marvel at massive beams of selenite.
Discovered by two miners looking for lead, the stunning white beams of gypsum have been growing at a snail's pace for hundreds of thousands of years and some now measure more than 30ft.
The huge mines at Naica have been
excavated for years, but in 1975 a massive area was drained so mining operations could take place and the incredible collection of gypsum was discovered.
The formations took shape when super-heated water began cooling and became saturated with gypsum. Over time, crystals formed in the water. One of the major problems still facing scientists wishing to study below the ground at Naica is the heat.
A hot spring located close to the Crystal Caves means the temperature is too hot for people to remain in the crystal chamber for longer than ten minutes at a time. Fortunately, other sections of the mine are air-conditioned.
Canadian explorer Kourounis is one of the few people who has dared to enter the cave and he told DailyMail.com it was one of the wildest experiences of his life.
He explained: 'The air temperature inside reaches 122F (50C) with a relative humidity of approaching 100 per cent making the air inside feel like 228F (105C)! We had to wear special ice-filled suits to enter the cave for brief explorations.'
Kawah Ijen Volcano and Sulfur Mine, Indonesia 
The Kawah Ijen volcano is known for its rich sulfur deposits which are being quarriedThe Kawah Ijen volcano in East Java, Indonesia, contains the world's largest acidic volcanic crater lake, famous for its turquoise color. It has a pH level of 0.5.
The active crater is known for its rich sulfur deposits which are being quarried.The volcano is one of several active stratovolcanoes - a volcano built up of alternate layers of lava and ash - constructed over the 12.5 mile wide Ijen caldera, the largest in Java.
Eruptions from Ijen are very hazardous because of the risk of the lake draining to form catastrophic lahars, destructive mudflows on the slopes of a volcano.
Coffee plantations cover much of the Ijen caldera floor, and tourists are drawn to its waterfalls, hot springs, and dramatic volcanic scenery.
Men working in the Ijen volcano range have a short life expectancy due to the punishing conditions they face every day in the depths of the mines.
They wear nothing other than t-shirts and trousers as they collect the yellow material, despite toxic fumes being given off and the fact that the molten sulfur is heated to more than 240F (115C).
They must also avoid the deadly turquoise-blue lake which takes up most of the crater floor, as it is made up of almost pure sulfuric acid, and would instantly kill anyone unlucky enough to fall in.
Sulfur is a natural source of sulfuric acid, and is used by oil refineries and in the production of goods such as detergents and fertilizers. It is also a key ingredient in match heads.
Slot Canyons, Zion National Park Flash-flood fatalities are in Zion are fairly rare, but visitors are warned to be very cautious if wet weather is on the horizon
There have been multiple deaths in the slot canyons of Zion National Park in Utah due to flash flooding. In 2015, seven hikers were swept to the deaths in the area of natural beauty.
The discovery of their bodies capped three days of searches by more than 60 park rangers, sheriff's deputies and emergency personnel from several agencies.
Park officials said all the victims were hiking together on a day trip through narrow Keyhole Canyon, a challenging route on the east side of Zion that requires canyoneers to swim through several pools of water and rappel steep slopes.
While the group obtained its permit for the trip, there were weather warnings at the time and the National Weather Service had forecast a 40 per cent chance of rain and the probability of flash flooding.
Despite the 2015 tragedy, and another in 1963 which claimed five lives, flash-flood fatalities are in Zion are fairly rare.
The most recent incident occurred in 2022, with an Arizona woman swept away when she was attempting to navigate a section known as the 'narrows.'
The National Park Service has various advisories on its website in a bid to prevent future disasters from happening. It warns visitors: 'Traveling into the Virgin River Narrows, even on short trips, can be challenging and risky and requires careful planning before you begin. Your safety depends on your own good judgment, adequate preparation, and constant observation.
'Flash floods, often caused by storms miles away, are a very real danger and can be life threatening. During a flash flood, the water level rises quickly, within minutes or even seconds.
'A flash flood can rush down a canyon in a wall of water 12ft high or more.