Go underground to discover caves, salt mines and war tunnels

Wieliczka, Poland

What: Sited on the outskirts of Poland’s cultural capital Krakow, this 900-year-old 
salt mine is a treasure trove of palatial caverns, underground lakes and beautiful chapels carved into the salt rock. It takes about three hours to tour this subterranean museum, 135m underground. Don’t leave without licking the 
salty wall.
See: krakow-info.com/wielicz

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Jeita Grotto, Lebanon

What: A six-mile-long cave system beneath the forest-clad hills of Mount Lebanon, Jeita Grotto is set 20km from Beirut. Ogle the underground world of brain-like stalictites and vertigo-inducing canyons 
then take a boat trip on 
a subterranean lake. 
See: lebanon-tourism.gov.lb

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Cheddar Caves, UK

What: Thought to be the site of prehistoric cheese-making (cheddar anyone?), Gough’s Cave is rich with massive rock chambers and formations. There are plenty of opportunities to go caving through ‘wild’ caves.
See: visitcheddar.co.uk

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Cu Chi Tunnels, Vietnam

What: During the Vietnam War, these tunnels were used as hiding spots for Viet Cong guerillas during combat. The tunnels now open to the public have been made three times larger to accommodate 
porky tourists.
See: vietnamtourism.com

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Potosi Silver Mine Tour, Bolivia

What: Not for claustrophobic types, a tour of a working silver mine in Potosi offers 
a fascinating insight into the tough life of a miner. Explode dynamite and chew on coca leaves while scrambling down narrow and steep tunnels.
See: travel-bolivia.com

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– Janine Kelso