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Deep underground, the Nazis built a city for thousands of soldiers. Now it’s a tourist attraction

CNN Travel's weekly newsletter, Unlocking the World, brings readers the latest updates on global destinations, aviation developments, culinary trends, and

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Published July 27, 2026
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Foto : Barbara Wilson - qwenews.com

Hidden Wonders: Underground Cities and Forgotten Places Await Discovery

Qwenews.com – CNN Travel’s weekly newsletter, Unlocking the World, brings readers the latest updates on global destinations, aviation developments, culinary trends, and accommodation options. This week’s travel highlights feature an extraordinary collection of historical sites and mysterious locations waiting to be explored.

The Nazi Underground City Beneath Poland

While the rural landscape surrounding Pniewo appears peaceful with golden fields and scattered woodland, something remarkable lies hidden below. The Ostwall represents an extensive subterranean network constructed during World War II by German forces before being left deserted in 1945. This massive complex stretches across twenty miles, containing tunnels, vertical shafts, railway stations built underground, and various military installations.

During the 1980s and 1990s, a distinctive group called the Bunker People claimed these tunnels as their own. They organized various gatherings within the underground passages, ranging from electronic music festivals to wedding ceremonies, though many events carried significant risks. Currently, the caverns serve as a sanctuary for approximately forty thousand bats seeking shelter in the perpetual darkness.

Modern travelers have discovered this location as a compelling dark tourism destination. Through the Międzyrzecz Fortified Region Museum, visitors can now explore nineteen miles of the original tunnel system. Read more here.

Rome’s Ancient Imperial Passage

Italy is preparing to open a remarkable historical corridor to the public this month. The Passage of Commodus, measuring one hundred eighty feet in length, has existed for two millennia. Roman emperors utilized this tunnel to enter the Colosseum without being noticed by crowds.

The passage derives its name from Emperor Commodus, famously depicted by Joaquin Phoenix in the film “Gladiator.” Historical scholars suggest that the emperor once escaped an assassination attempt through this very tunnel. His life would eventually conclude when a professional wrestler strangled him to death.

London’s Underground Treasure

Enthusiasts of hidden subterranean spaces have another exciting development to anticipate. The London Tunnels project aims to open in the British capital around 2028. This extensive network spans one mile and was originally constructed to protect civilians during World War II.

Later, the tunnels housed Britain’s Special Operations Executive, which operated as an extension of MI6 and served as the real-world inspiration for James Bond’s Q Branch character. A substantial investment of one hundred forty-nine million dollars is funding the transformation, with ambitions to create London’s most impressive new visitor attraction. CNN provided an exclusive preview of the site earlier this year.

Turkey’s Ghost Town and Babylon’s Ancient Ruins

Kayaköy, located in southwestern Turkey, experienced remarkable prosperity over a century ago with a population exceeding ten thousand residents. Following the Greco-Turkish conflict, the settlement was abandoned and transformed into a haunting reminder of turbulent historical periods. The decaying structures, gradually reclaimed by vegetation, create an atmosphere that becomes increasingly atmospheric during cooler months when fog rolls in from the sea. Visitors currently pay three euros to navigate the uneven pathways and narrow streets.

Meanwhile, Babylon in contemporary Iraq continues to captivate visitors despite its deteriorating condition. Once considered the crown jewel of Mesopotamia and among the most significant urban centers of ancient times, the archaeological site now features overgrown walkways and limited amenities. Nevertheless, when afternoon sunlight illuminates the remaining steps and statues, visitors experience a profound connection to the era of ancient monarchs.

America’s Haunted History

The Trans-Allegheny Lunatic Asylum in West Virginia presents an imposing appearance that earned it the reputation of a nightmare facility. Originally established as a compassionate institution, severe overcrowding eventually forced medical personnel to implement desperate solutions. Today, both daytime and nighttime tours reveal the facility’s intricate past, occasionally offering supernatural encounters. While many former mental institutions have become macabre attractions ranging from respectful to sensationalist presentations, CNN examined the unexpectedly positive evolution of asylum tourism across America.

Additional Stories Worth Discovering

Several other compelling narratives round out this week’s travel coverage:

A mysterious creature caused school closures in a West Virginia riverside community back in 1967, and local residents continue seeking explanations for the phenomenon.

Funerals in New Orleans have evolved into vibrant street celebrations, reflecting the city’s unique cultural traditions where brass music remains woven into its identity.

Chicago’s notorious “rat hole” has a more complex origin story than commonly believed, with the public receiving an incomplete version of events.

A ninety-four-year-old woman continues wearing vintage clothing, prompting strangers to search for the individual recognized as “the last queen.”

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