Kat Ferguson's User Profile - Atlas Obscura
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Places visited in Charleroi, Belgium
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Edinburgh, Scotland

Cramond Ghost Island

Accessible only at low tide, the deserted island is dotted with World War II ruins.
London, England

Greenwich Foot Tunnel

A 1,215-foot tunnel transports pedestrians beneath the River Thames.
Helsinki, Finland

Temppeliaukio Church

A subterranean house of worship carved right out of the bedrock.
Vilnius, Lithuania

Bėgių Parkas (Railway Park)

A wide array of locomotives call this outdoor museum home.
Kaunas, Lithuania

George Maciunas Square

The world's first invisible city square is an homage to a man who pushed the boundaries of art.
Riga, Latvia

Latvian Railway History Museum

A collection of historical engines and rolling stock from throughout Riga's rich railway history.
Põhja-Tallinna, Estonia

Fortress Patarei

A former imperial sea-fortress and Soviet prison.
Tallinn, Estonia

Linnahall

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.
Istanbul, Turkey

Museum of Energy

This shuttered power plant is now Turkey's first industrial archaeology museum.
Istanbul, Turkey

Basilica Cisterns of Istanbul

A marvel of Byzantine engineering under the streets of Istanbul.
Zurich, Switzerland

Ehgraben (Medieval Sewage Ditch)

Use a key to unlock this medieval sewer tunnel.
Ostrava, Czechia

Lower Vítkovice

A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.
Prague, Czechia

The Old Wastewater Treatment Plant Stará čistírna

One of the oldest, well-preserved water treatment facilities in all of Europe.
Zagreb, Croatia

Grič Tunnel

A World War II evacuation tunnel turned into a history display of Croatian state and people.
Ljubljana, Slovenia

Slovenian Railway Museum

This former railway facility is the oldest in Slovenia, and now houses a museum showcasing the history of steam locomotives.
Athens, Greece

Hadrian's Reservoir

This ancient hydrological marvel is now the base of a modern outdoor cinema.
Valletta, Malta

Valletta Tunnels

A centuries-old forgotten underworld lies beneath Malta.
Vienna, Austria

Vienna Sewer System

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.
Barcelona, Spain

Sewers of Barcelona

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.
Cologne, Germany

Chandelier Hall

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.
Limbiate, Italy

Mombello Psychiatric Hospital

A dilapidated psychiatric facility on the outskirts of Milan where electroconvulsive therapy was developed and Napoleon once lived.
London, England

The Lost River Fleet

The largest of London's subterranean rivers and once a mad, bad center of London life.
Berlin, Germany

Ballhaus Riviera

The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.
London, England

Battersea Power Station

Pop culture has helped to keep this iconic British building from being destroyed.