Many of the wealthiest people in the world are concentrated in just a handful of cities -- several of which are in the U.S.

Explore the factors contributing to the immense wealth concentration in these American cities and their global significance.

The United Arab Emirates' Etihad Rail has unveiled plans for a high-speed train line between Abu Dhabi and Dubai. It will span 93 miles and take just 30 minutes.

Luxembourg, with its high GDP per capita and strong financial sector, is the richest country in the world. The nation is known for using its wealth to ensure better living standards, healthcare ...

New York City is home to the world’s most millionaires and centimillionaires ... Here’s a complete look at the 10 wealthiest cities in America, ranked by number of millionaires.