There are almost 2 million kilometers of gas pipelines in the United States. Here is how other countries compare.
Macedonia might join the list of countries that have recently been renamed after holding a referendum on changing its name on September 30.
The number of nuclear weapons in the world is declining, but countries that possess them are modernizing their stockpiles and are not likely to give them up for the foreseeable future.
Italy, China, and Spain lead the way when it comes to the number of UNESCO* cultural and national heritage sites.
This graph shows how value of the Rial is declining since the beginning of the year.
The leaders of Azerbaijan, Iran, Kazakhstan, Russia, and Turkmenistan signed a convention
on the legal status and delimitation of the Caspian Sea.
Since April 2018, the black-market dollar-exchange rate for the Iranian rial has risen sharply, reflecting the poor state of the country's economy and sparking protests.
Venezuela, Saudi Arabia, and Canada own the largest proved oil reserves in the world.