Once the summer retreat of Gilded Age industrialists, Newport, R.I., saw its fortunes fade during the 20th century. Now, historic mansions are being restored as vacationing billionaires buy homes here. Photo: Julie Bidwell for The Wall Street Journal Subscribe to the WSJ channel here: http://bit.ly/14Q81Xy More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com Follow WSJ on Facebook: http://www.facebook.com/wsjvideo Follow WSJ on Google+: https://plus.google.com/+wsj/posts Follow WSJ on Twitter: https://twitter.com/WSJvideo Follow WSJ on Instagram: http://instagram.com/wsj Follow WSJ on Pinterest: http://www.pinterest.com/wsj/