In case you are a frequent traveler and like vacationing with your family or friends, you sure are supposed to know about the place you are about to travel. Here is a collection of articles which will help you find helpful information like modes of travel, best season to visit, etc about these places.
10 Massive Holes In The Earth's Crust
Where: Pechengsky District, Russia

This hole is the result of a scientific drilling project of the Soviet Union in the Pechengsky District, on the Kola Peninsula. The project has dug the deepest artificial point on Earth, measuring a crazy 40,230 ft!