The article 'Going underground at the Colosseum' was published in partnership with Lonely Planet.
The underground chapel contains the remains of around 4, 000 friars buried between 1500 and 1870.
Growing underground, it is prone to infestation by the feathery mottle virus and worms.
The oldest metro in the world, though, is the London Underground, which opened in 1863.
This underground, nocturnal world of tango offers the purest way for visitors to experience the dance.
The company helps oil producers chart underground formations that might contain oil or gas.
Closer to Orchard Road, the giant Zouk and Velvet Underground are popular with Singaporean college students.
"Underground, everything is much more stable, " says Zhao, referring to factors such as temperature, humidity and vibration.
Considering its age, the underground city is in excellent condition and is accessible today via numerous tours.
"A project like this will give us more confidence to carry out the next project underground, " says Tan.
The hotel sits directly above the Bonaventure metro station and underground city, making it popular with conference groups.
In some areas of Staten Island, Brooklyn and Queens, some sub stations will be placed underground.
'Poems on the Underground' in London, introduced a range of poets to millions of commuters.
Work on the fibre-optic underground cable network will start immediately and be 90% complete by 2014.
The Obama campaign has repeatedly said that the Illinois Democrat repudiates the Weather Underground's activities.
Meteorologists warned residents to go underground to survive a direct hit from the tornado.
Millions of people travel on underground urban transit systems in cities across the world.
The Weather Underground site has a bunch of good tropical storm models and radar feeds.
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The collapse occurred at the Big Gossan underground mine, about a kilometer away from Grasberg.
Freeport has been ramping up operations at its underground mines amid declining surface production.
Families exchange visits, and there is reputed to be a growing underground population of refugees.
Better yet, the carbon dioxide in the exhaust gases could potentially be captured and buried underground.
Moreover, to move it underground would not change its influence or the ideas that it promotes.
Coming up, remembering a time when people in London went to The Underground for safety.
Wildlife cops are few and far between, and the bad guys operate deep underground.
Rome's other great underground adventure lies out near the Appia Antica, to the southeast of town.
Officers said those dead were likely pushed underground by the weight of falling masonry.
Information security firm RSA recently took a stroll through the underground market for personal details.
Dating the rocks in London doesn't tell you the age of the London Underground.
BBC: NEWS | Science/Nature | Early life thrived in lava flows
An underground activist group called Sokwanele has an anonymous blog that 1, 420 other sites link to.
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