When you hear underground attractions do you th

first_imgWhen you hear “underground” attractions, do you think of nightclubs and other attractions that only the “in the know” know about?Well, the people at oyster.com are talking about things that really are under the ground, like the catacombs in Paris, an underground salt mine with a mini-golf course in Poland to a crystal-filled cave in Mexico.Read on for more on these underground treasures.last_img