10 Of The Most Incredible Underground Cities

Portland, Oregon

Portland, Oregon, is one of the biggest cities within the Pacific Northwest of the United States. Underneath the large city are the Shanghai Tunnels, which begin underneath Chinatown. They were used to transport goods and people.

Wieliczka Salt Mine, Poland

Wieliczka Salt Mine, Poland was constructed during the 13th century, and produced salt until recently. The massive underground site contains statues, chapels, and a church. Over one million people visit every single year.

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