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

(CNN) — In our roundup of travel stories this week: the seven-foot “monster” that stalked West Virginia, the Roman tunnel where a hated emperor nearly met his end, and the enormous bunker city built by Nazis in central Europe.

Poland’s Nazi labyrinth

The countryside around the little Polish village of Pniewo looks serene, with its yellow crops and patches of forest, but beneath the surface lies a sprawling 20-mile maze of tunnels, shafts, underground railway stations and combat facilities.

This is the Ostwall, a fortified subterranean complex built by the Nazis and abandoned in 1945. In the 1980s and ‘90s, a subculture known as the Bunker People took over the tunnels, hosting unauthorized and often dangerous events here, from raves to weddings. Today, bats are its inhabitants, some 40,000 of them taking refuge in the darkness.

In the 21st century, it’s been given new life as a dark tourism destination, with 19 miles of tunnels open to explore in the Międzyrzecz Fortified Region Museum. Read more here.

Rome’s murder-plot tunnel and London’s Cold War spy maze

In Italy, a 2,000-year-old tunnel once used by Roman emperors to slip unseen into the Colosseum will open to the public this month. The 180-foot Passage of Commodus takes its name from Emperor Commodus, who you may remember as the conniving meanie portrayed by Joaquin Phoenix in “Gladiator.” Experts believe he once survived an assassination attempt here. He would later meet his end being strangled by a champion wrestler.

Fans of secret underground complexes will have much to celebrate when The London Tunnels opens in the UK capital, with a speculative date of 2028. This mile-long series of chambers was built to shelter citizens in World War II, before becoming the home of Britain’s Special Operations Executive, an offshoot of MI6 and the real-life inspiration for James Bond’s Q Branch. It’s undergoing a $149 million transformation in hopes of becoming the city’s grandest new tourist attraction. CNN went down below for a sneak preview earlier this year.

Turkey’s ghost town and Iraq’s lost city

Just over a century ago, Kayaköy in southwest Turkey was a bustling town of more than 10,000 people. Abandoned by its occupants and haunted by the past, it’s now a ghost town, a physical reminder of darker times following the Greco-Turkish war.

Its crumbling buildings swallowed by greenery are starkly beautiful and deeply eerie, even more so as the cooler seasons creep in and sea mists descend. Today’s visitors pay a three-euro fee to wander its uneven lanes and alleyways. Here’s what CNN discovered on its visit.

Babylon, in modern Iraq, meanwhile, was the jewel of Mesopotamia and one of the most important cities in antiquity. Today, its ancient ruins are a site in distress, its paths overgrown and facilities scarce. But when the late afternoon sun hangs heavy over Hillah, its steps and statues bathed in heat and light, visitors still feel that they are standing in the footprints of kings.

America’s most haunted

The Trans-Allegheny Lunatic Asylum in West Virginia looks like the asylum of nightmares and for many, it was. But it started out as a place of compassion whose massive overcrowding led to desperate measures by doctors and staff. Daily and nightly tours now offer visitors its complex history, along with an occasional paranormal scare.

Many former asylums are now macabre tourist attractions, whose treatment of their subject matter can range from the sensitive to the sensationalist. CNN delved deeper into the surprisingly hopeful history of asylum tourism in America.

In case you missed it

A ‘monster’ shut down schools in this riverside town in 1967.

Residents still want answers.

How funerals became New Orleans’ most joyful street parties.

Brass music is in the city’s “DNA.”

The surprising origin of Chicago’s infamous ‘rat hole.’

The public got this one wrong.

She’s 94 and dresses in clothes from a bygone era.

Now strangers search for the woman known as “the last queen.”

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Darline Graham says she’s ‘not that informed on national security’ at debate

▶ Watch Video: Darline Graham and Ralph Norman head to runoff in South Carolina's Republican Senate primary Sen. Darline Graham fumbled a question on national security in the South Carolina GOP Senate debate, admitting she was "not that informed on national security" and neglecting to answer a question about Taiwan and the South China Sea.  The novice senator is beginning her sixth week on the job, having been appointed to fill her late brother Lindsey Graham's seat two days after his sudden death on July 11. Lack of experience is one of the primary criticisms facing her campaign. At Tuesday's debate, Rep. Ralph Norman, her GOP opponent who also advanced to the runoff behind Graham in the Aug. 11 primary, called her an "unknown candidate" while also representing mainstream Washington."I'm just going to be honest here," Graham answered when asked if Taiwan and the South China Sea are national security issues for the United States. "I'm not that informed on national security, so — but I do support the military."To the same question, Norman cited the importance of Taiwan's chip production and said, "what the president is doing right is he's enabling Taiwan to defend themselves against China."Graham later called China a national security threat, advocating for "any type of bans against China" from AI to farmland, and she also fielded questions on Iran and Israel. The candid revelation, however, has still drawn scrutiny. "Lindsey Graham was well informed on the United States' national security," former South Carolina Gov. Nikki Haley wrote on X. "Darline Graham admits she's not. This is not something you inherit. And it's critical in the U.S. Senate."The Democratic nominee for the Senate seat also chimed in. "Darline Graham Nordone is asking for six years as South Carolina's senator — during wartime — yet has the gall to tell voters 'national security isn't my thing,'" Dr. Annie Andrews wrote. "South Carolina deserves better."Graham is backed by President Trump. While Lindsey Graham was focused on foreign policy and national security, having returned from a trip to Ukraine to visit President Volodymyr Zelenskyy a day before his death, his sister has vowed to focus on issues affecting South Carolinians. She told CBS News' Mark Strassmann last week that "affordability is a number one issue, definitely for me." Both candidates conveyed strong conservative beliefs and did not vastly differ in their policies. They pledged loyalty to Mr. Trump, agreed Iran was a threat, recognized Israel as an ally and advocated for the SAVE America Act and a ban on birthright citizenship.Graham ended the night on a fiery note, responding to Norman's criticism that she canceled a second debate. "I'd rather be out in South Carolina meeting the voters than here on this stage with you," Graham chirped back.She then touted her work in the Senate thus far, including helping pass the Russia Sanctions Bill, co-sponsoring the SAVE America Act and casting a key vote to confirm Attorney General Todd Blanche. "I've done more in 20 days than you have done in 20 years," Graham said. The runoff for the Republican nominee will be held on Aug. 25. 
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