This article will introduce the 10 highest Waterfalls in the World

This article will introduce the 10 longest car tunnels in the world.

This article introduces the 10 highest mountains in the world.

This article will introduce the 10 longest railway and road bridges in the world.

This article introduces the 10 largest lakes in the world.

This article introduces the 10 buildings that currently rank as the tallest in the world. 

Annual “World Happiness Report” was released by the United Nations Sustainable Development Solutions Network.

The Human Development Index is a composite index released in Human Development Report by one of the United Nations divisions. The index is calculated using some important factors as life expectancy, education, and income per capita.