The six million skeletons hidden in more than 150 miles of tunnels under the streets of Paris

From the Eiffel Tower to the Louvre, the best tourist attractions in Paris attract around 50 million visitors to the French capital every year.

But many travelers miss one of the more curious sights of the city – because it is completely underground.

Hidden under the streets of Paris is a labyrinth of tunnels with more than six million skeletons in it.

The catacombs were first opened in the late 18th century when public health problems at the Paris cemeteries led the authorities to move the skeletons to an underground site.

The last bones were placed in the catacombs in 1860, but the site was first opened to the public in 1809. The first visits were only by appointment, but soon became very popular.

While only a small part of the catacombs is open to the public today, the entire network is supposed to be around 174 miles long.

Nowadays, tourists can visit the site and the catacombs get around 550,000 visitors a year.

Travelers must descend 131 steps, 20 meters to the ‘depths of Paris’ to reach the site.

Hidden under the streets of Paris is a labyrinth of tunnels with more than six million skeletons in it

The last bones were placed in the catacombs in 1860, but the site was open for the first time to the public in 1809

Although only a small part of the catacombs is open to the public today, the entire network is supposed to be around 174 miles long

Visitors then follow a 1.5 km route around the catacombs that lasts about an hour.

And although the catacombs are open all year round, there is a particularly good reason to visit in the summer.

Even if the temperatures outside the heat wave level are outside, it is generally never warmer than 14 degrees in the catacombs, making the tunnels the perfect cool escape in warm weather.

No matter how unusual it seems like a tourist attraction, the catacombs have collected a 4.1/5 star rating on TripAdvisor.

A reviewer writes: ‘What a unique experience in Paris. It was an informative experience. ‘

Another person says: ‘Weird but interesting. The bones were arranged and professionally stacked. ‘

And another person reveals: ‘This was my favorite part of my trip to Paris. I am a nurse and a science enthusiast, and I have convinced that everyone with great interest in history enjoys visiting the catacombs. ‘