Explore these amazing abandoned tunnels worldwide
What's the story
Abandoned underground tunnels provide a rare look at history and architecture, and it is no surprise that explorers from all over the world are drawn to them.
These hidden passageways, which are generally lost to time, present thrilling opportunities for adventurers.
From ancient aqueducts to defunct railways, these tunnels speak of the past, while challenging present-day explorers with their enigmatic charm.
Here are some amazing places that beckon adventurers to come and explore!
Paris Catacombs
Paris Catacombs: A maze beneath the city
The Paris Catacombs are a series of underground ossuaries in France's capital. Originally, the underground tunnels were limestone quarries, which became a cemetery in the late 18th century.
Spanning over 200 miles, only a small part of the catacombs is legally open to the public.
The catacombs contain remains of over six million people and provide an interesting experience for history buffs and urban explorers.
Edinburgh Vaults
Edinburgh Vaults: Hidden chambers below
Beneath Edinburgh's South Bridge lies a series of chambers called the Edinburgh Vaults.
Built in the late 18th century, the vaults were originally used for storage and workshops. However, they soon became the stage for illegal activities.
Today, guided tours allow visitors to explore these dark spaces. They are packed with tales of intrigue and mystery from Scotland's past.
Shanghai Tunnels
Shanghai Tunnels: Secrets under Portland
The Shanghai Tunnels sit beneath Portland, Oregon, USA.
These tunnels were said to be used in the early 19th century to ferry goods from ships parked at the waterfront straight into downtown businesses.
Legends say they were also put to use for less savory things like human trafficking or "shanghaiing."
While a lot of this remains speculation, guided tours give a peek into this fascinating part of Portland's history.
Naples underground
Naples underground: Ancient passageways revealed
Naples Underground is a massive network below Italian city's busy roads that is over 2,000 years old.
It was first dug out by Greeks as cisterns for water supply systems in the Roman era, and then used for various purposes such as air raid shelters during World War II bombings on Naples.
Today, parts open through guided tours reveal layers upon layers rich with history just below the surface.