Mount Roraima is an exciting mountain which can be found in Venezuela. It is placed on the border crossing between Venezuela, Brazil and Guiana. This mountain is different than the most others on the Earth, it has a flat top and it is the highest flat-topped mountain in the world, reaching the height of 2810 meters.
Devetashka Cave, Bulgaria. Devetashka cave is located 15 km (9.3 mi) northeast of Lovech and approximately 2 km (1.2 mi) from the village of Devetaki. Devetàshka cave is huge karst cave in Bulgaria, known for its long term occupancy for human and other type biological populations during extensive historical periods. It is also home to nearly 30,000 bats.