The most difficult national parks riddles

Located in Montezuma County, Colorado, the park protects some of the best-preserved Ancestral Puebloan archaeological sites in the United States. It's one of the three UNESCO World Heritage Sites located in the U.S. that are credited to the Anasazi, alongsidde with Chaco Culture National Historical Park and Taos Pueblo.

Gunung Mulu national park is located in the eastern province of Sarawak, Malaysia. It is located on Borneo, near the southern border of Brunei. Gunung Mulu National Park has the largest known natural chamber or room – Sarawak Chamber. It is 700 m (2,300 ft)) long, 396 m (1,299 ft) wide and at least 70 m (230 ft) high

Northeast Greenland National Park is the largest protected land area in the world. Established in 1974 and expanded to its present size in 1988, it protects 972,001 km2 and is bigger than all but twenty-nine countries in the world.