Buraco das Araras (Goiás)
Buraco das Araras (GO-016) (English: Hole of the Macaws) is one of the largest quartzitic caves located in the State of Goiás, Brazil. It is located about  west of Brasília and  from the district of Bezerra, in the municipality of Formosa. It is considered one of the largest sinkholes (dolinas) in the world. Description 
Discovered in 1912, it is believed that the hole has been formed by the collapse of the roof of a cave. The cave itself is  deep and  wide, having in its midst a dense rainforest with gigantic ferns typical of a primitive age. Getting there 
To reach it the traveler must travel  from Formosa, following BR-20 north as far as the village of Bezerra. Four kilometers after the settlement, one should turn left and drive on a dirt road for  and then turn left for two more kilometers. See also 
 List of caves in Brazil
 Gruta do Centenário
 Lapa Terra Ronca

References 

Caves of Goiás
Quartzite caves
Wild caves
Sinkholes of South America
Tourist attractions in Goiás