It is not a rumour.

There are still in existence underground cities on planet earth.

Many of these cities dates back to centuries and were used for various activities.

5 Mysterious Underground Cities You Won’t Believe Exist, Their Locations and the Stunning Stories Behind Them

Some underground cities have been used for illegal activities in times past Photo Credit: REDA&CO, Richard BakerSource: UGC

Legit.ngpresents stories behind some of these mystery underground cities and where they are situated.

It was said to have accommodated over 20,000 persons many years ago.

Now, it is a good tourist destination.

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It has hotels, bars and so forth.

Bakeries, stables, wells are some of the things that can be found in this mystery city.

Wieliczka Salt Mine, Poland

The Wieliczka Salt Mine located in Poland is another interesting underground city.

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The site which dates to the 1200s is also referred to as the Underground Salt Cathedral.

It was previously a salt-producing location until 2007.

It consisted of fallout-proofed tunnels and rooms, skating rinks and even a 1000-seat movie theatre.

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It was eventually opened for tourists in the early 2000s.

@jrstonelive wrote:

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