Disney World mysteriously closed an island 20 years ago and left it in ruins. Take a look inside.

On the official map of Disney World , there is a blank green mass in the middle of Bay Lake in Orlando, Florida . The mysterious island is not labeled and no one is allowed to enter not Disney World guests and not even Disney World employees. But two decades ago this unlabeled island was actually another Disney amusement park called Discovery Island. It mysteriously closed in 1999.

For nearly 20 years, Discovery Island has remained under lock and key, people banned from stepping foot inside. But a few years ago, YouTuber Matt Sonswa snuck onto the island to capture the park in ruins.

This is what he saw.

Discovery Island originally opened in 1974 under its original name, Treasure Island.

Bright Sun Films/ Getty

In 1976, the park was renamed Discovery Island and was meant to be a relaxing destination to view exotic birds and fauna.

Bright Sun Films/ YouTube

The park was marketed as an alternative for families who needed a break from the main Disney World attractions.

The park was known for its wide species of exotic birds that came from all over the world.

Bright Sun Films/ YouTube

From flamingos to cockatoos, the island was designed to be an avian paradise.

Bright Sun Films/ YouTube

You'd have to take a boat from the mainland to arrive at Discovery Island and experience the wild birds.

In 1999, Animal Kingdom opened, diminishing the number of guests at Discovery Island.

Matt Sonswa/ YouTube

Today, the island lies in ruins, completely overrun by nature. The main loading dock, for example, where guests would disembark from boats and officially enter Discovery Island, still stands today.

Matt Sonswa/ YouTube

You can still see the small stand where someone would check your admission tickets in Sonswa's footage.

You can imagine the number of people who stood in this waiting area to board boats back to the main part of Disney World.

Matt Sonswa/ YouTube

Instead of being crowded with people, this boarding area is overrun with leaves and nature.

The first building you encounter is the Thirsty Perch, which was a concession stand at the entrance of the island.

Matt Sonswa/ YouTube

Some of the quirky decor on the Thirsty Perch still clings to the buildings exterior.

Matt Sonswa/ YouTube

Some aspects of the island have withstood the force of nature and even hurricanes, according to Sonswa's video.

A small walk leads to one of the biggest buildings on the island, an animal hospital and nursery, which still stands decades later.

Matt Sonswa/ YouTube

Inside the hospital is a cooler that still holds some medications and supplies for the animals.

Matt Sonswa/ YouTube

Other parts of the building havent remained as fully intact, however.

Matt Sonswa/ YouTube

With entire walls collapsing and nature growing inside buildings, it's easy to see how this island has been left uninhabited for decades.

Even the bathroom has become overrun by Mother Nature.

Matt Sonswa/ YouTube

Sonswa captured every corner of this island on camera to show the world what happened to the forgotten Discovery Island.

An incubator still stands in an otherwise empty room inside the hospital.

Matt Sonswa/ YouTube

Near the animal hospital is a public restroom, which no longer has a roof, allowing for nature to take its toll.

Bright Sun Films/ YouTube

The islands main attraction was Avian Way, which guests entered through this door.

Matt Sonswa/ YouTube

The doorway would lead to an elevated walkway which was covered in an overhead canopy.

Bright Sun Films/ YouTube

For the most part, the structural foundation of the walkway remains intact.

Some of the canopies also remain intact but most are weighed down with leaves.

Matt Sonswa/ YouTube

The Avian walkway was supposed to be a great way to witness the rare birds of Discovery Island.

In other parts of the island, trees have fallen onto the walkway, destroying the site entirely.

Matt Sonswa/ YouTube

Not everything fared well in the decades of abandonment.

Its difficult to imagine that this decrepit walkway was once filled with families on vacation.

Matt Sonswa/ YouTube

The island also has a service and maintenance area that was used by Disneys cast members.

Matt Sonswa/ YouTube

On the ground, there is a pile of signs that were most likely taken down when the island was closing for good.

Matt Sonswa/ YouTube

Walking down the abandoned path is eerie, imagining the past employees who worked to keep this place running up until its demise.

Matt Sonswa/ YouTube

Now workers are employed to guard the island from intruders. In fact, Seph Lawless another person who snuck on the island said you're not supposed to get closer than 50 feet.

"When you're on Bay Lake you're almost chaperoned," he told the BBC . "They have several security people on boats that watch you. If you get too close to the island they push you away. They'll yell at you, they're constantly watching you."

Even the ice machine still stands today.

Matt Sonswa/ YouTube

Lawless, the photographer who snuck on the island, is disappointed that the Disney company has not done anything with the island.

"There was old attractions decaying, which was overgrown with weeds, trash scattered around," he told INSIDER. "I was shocked that a billion dollar company like the Disney Corporation would just leave part of their property like this. No billion dollar company should be powerful enough not to clean up their mess."

Other dilapidated structures can be found all over the island, like the cages that animals were once held in but now are covered in branches and leaves.

Matt Sonswa/ YouTube

The entire island is a mix of perfectly preserved remnants of the island's past and completely rotted structures that point to the park's untimely demise.

As the island continues to rot, Disneys plans for the future of the island remain unclear.

Matt Sonswa/ YouTube

Some say it will be turned into villas for Disney vacationers, while others think it will continue to stay in its current state. One Disney employee said the company will never touch it because of pollution from nightly fireworks . Others say the waters surrounding the island are infected with bacteria after a boy died in 1980, according to the BBC.

Either way, the fate of Disney's secluded and abandoned island remains a mystery.

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Disney World mysteriously closed an island 20 years ago and left it in ruins. Take a look inside.

Discovery Island originally opened in 1974 under its original name, Treasure Island.

In 1976, the park was renamed Discovery Island and was meant to be a relaxing destination to view exotic birds and fauna.

The park was known for its wide species of exotic birds that came from all over the world.

From flamingos to cockatoos, the island was designed to be an avian paradise.

In 1999, Animal Kingdom opened, diminishing the number of guests at Discovery Island.

Today, the island lies in ruins, completely overrun by nature. The main loading dock, for example, where guests would disembark from boats and officially enter Discovery Island, still stands today.

You can imagine the number of people who stood in this waiting area to board boats back to the main part of Disney World.

The first building you encounter is the Thirsty Perch, which was a concession stand at the entrance of the island.

Some of the quirky decor on the Thirsty Perch still clings to the buildings exterior.

A small walk leads to one of the biggest buildings on the island, an animal hospital and nursery, which still stands decades later.

Inside the hospital is a cooler that still holds some medications and supplies for the animals.

Other parts of the building havent remained as fully intact, however.

Even the bathroom has become overrun by Mother Nature.

An incubator still stands in an otherwise empty room inside the hospital.

Near the animal hospital is a public restroom, which no longer has a roof, allowing for nature to take its toll.

The islands main attraction was Avian Way, which guests entered through this door.

The doorway would lead to an elevated walkway which was covered in an overhead canopy.

Some of the canopies also remain intact but most are weighed down with leaves.

In other parts of the island, trees have fallen onto the walkway, destroying the site entirely.

Its difficult to imagine that this decrepit walkway was once filled with families on vacation.

The island also has a service and maintenance area that was used by Disneys cast members.

On the ground, there is a pile of signs that were most likely taken down when the island was closing for good.

Walking down the abandoned path is eerie, imagining the past employees who worked to keep this place running up until its demise.

Even the ice machine still stands today.

Other dilapidated structures can be found all over the island, like the cages that animals were once held in but now are covered in branches and leaves.

As the island continues to rot, Disneys plans for the future of the island remain unclear.