Spillway in a dam’s reservoir, Northern California

The largest man-made hole is located in the United States in Northern California. The spillway is extremely impressive — tons of water crashes down through it in just seconds. This construction was built 50 years ago.

Guatemala City sinkhole

This sinkhole was created naturally not very long ago. On June 1st, 2010, a 3-story factory, together with a house standing next to it, collapsed under the ground in one of Guatemala’s districts right in the middle of the day.

St. Patrick’s Well, Orvieto, Italy

Despite its evil look, this well was built with noble intentions — to provide the city with water during the siege. Moreover, it was created under the church’s patronage.

Crater of Mount Yasur, Vanuatu Island

Yasur is an active volcano on Vanuatu Island. Its last eruption took place in 2017.Tribes living on the island believe that there is an ancient deity living in the crater of this volcano that can get furious if they bother him.

Big Hole in Kimberley, South Africa

Big Hole is a huge nonactive mine in Kimberley city. It’s hard to imagine, but in pursuit of diamonds, people managed to dig this hole without using any equipment.

Great Blue Hole, the Belize Barrier Reef

A giant marine sinkhole with a diameter of 1,000 feet and a depth of almost 400 feet was formed naturally. This destination attracts avid divers because of its mystery, but many of them lose their lives here. The hole even has the unofficial name — “Diver’s Cemetery.”

The Inverted Tower of Masons, Portugal

There was a mysterious well built in the last century in Sintra, a town in Portugal. It serves as a transition from darkness to light. The spiral staircase that surrounds the well symbolizes passing the circles of heaven or hell, depending on which direction you’re going.

Cerro Sarisarinama, Venezuela

There are many tepuis located within the territory of Venezuela. Hundreds of years ago enormous sinkholes were formed in them. The biggest ones are located on Mount Sarisariñama in the Venezuelan state of Bolívar.

Mutnovsky Ice Caves, Russia

The Mutnovsky volcano, where scientists have discovered an ice cave, is located on the Kamchatka Peninsula in Russia. The volcano and the ice cave are next to each other.

Gates of Hell (Darvaza), Turkmenistan

This gas crater was created by people. It’s called the “Gates of Hell” and it’s been almost half a century since the fire that was lit in 1971. There was a ground collapse while drilling and natural gas started to come out. The diameter of the hole is almost 200 ft, while its depth is about 65 ft.