While most Americans are drowning in debt or struggling with rising housing costs, the world’s tech billionaires are living in luxury mega-mansions that would make the Gilded Age robber barons blush.

Cristiano Ronaldo has been building a luxury mega mansion in Portugal for over three years and the property is now complete.

Explore a sustainable mega mansion featuring modern design, smart home technology, and eco-conscious amenities.

In one of America's wealthiest neighborhoods lies an abandoned mega-mansion that was once the home of Kenny Rogers. Built in the early 1990s, this castle-like estate was valued at $15 million and ...