Article: Guernsey – German Military Underground Hospital

The link below is to an article that takes a look at a German Military Underground Hospital built during WWII on Guernsey, a territory of the United Kingdom.

For more visit:
http://www.atlasobscura.com/places/german-military-underground-hospital

Article: Historical Underground Rivers

The link below is to an article that looks at 8 historical underground rivers.

For more visit:
http://mentalfloss.com/article/49004/8-underground-rivers

Article: Underground Cities of Cappadocia

The link below is to an article looking at the underground cities of the Cappadocia region of the Roman Empire. There are a lot of photos in the article.

For more visit:
http://dornob.com/underground-cities-3500-years-of-cappadocian-cave-homes/