See inside Marble House, Alva Vanderbilt Belmont's 140,000-square-foot Newport mansion that appears in 'The Gilded Age'

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Marble House in Newport, Rhode Island.
Marble House is in Newport, Rhode Island.

Alexander Nesbitt — The Preservation Society of Newport County

Inside a 100-year-old 'Cinderella' castle home, on the market for $1.8 million

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Villa Keen front view
Villa Keen is on the market for $1.8 million.

Corcoran Baer & McIntosh

See inside Staatsburgh, a 30,000-square-foot Gilded Age mansion whose owners held tickets for the Titanic

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Staatsburgh
Staatsburgh is about two hours from New York City.

Talia Lakritz/Business Insider

I visited Sagamore Hill, the country estate of President Theodore Roosevelt, dubbed the 'Summer White House.' Take a look.

Tech Insider : Travel, Business, Economy
sagamore hill house
Sagamore Hill on Long Island, New York.

Gabbi Shaw/Business Insider

Gilded Age townhouse sells for $34.5 million in NYC, ending 2 sisters' heated bankruptcy battle

Tech Insider : Business
The library of House of Cassini features 17-foot ceilings bedecked by plaster sculptures of owls, urns, and cherubs.
The library of House of Cassini features 17-foot ceilings bedecked by plaster sculptures of owls, urns, and cherubs.

Evan Joseph

Two evicted sisters try to derail $34.5 million sale of Gilded Age home

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A composite photo shows a $34.5 million Gilded Age mansion and Marianne Nestor, who with her sister are fighting to reclaim it.
Judges have been trying to sell this $34.5 million Gilded Age mansion for six years. Designer Oleg Cassini's widow, right, and her sister, both in their 80s, keep fighting to reclaim it.

Evan Joseph, left/Getty Images, right

This Washington, DC, rowhouse was built during George Washington's presidency. Now it's on the market for $1.3 million.

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Exterior of 1317 4th Street SW, a 1790s row home in Washington, D.C.
1317 4th Street SW was built in 1794.

Justin Callas/Arume, LLC

Look inside Vizcaya, Miami's 45,000-square-foot Gilded Age mansion that now counts Ken Griffin as a neighbor

Tech Insider : Travel, Travel, Business
aerial view of the Vizcaya Museum and Gardens in Miami, Florida
James Deering's 1916 winter home is located less than 10 minutes away from the heart of Miami.

Robin Hill/Courtesy of Vizcaya Museums and Gardens

Inside the homes where US presidents moved after leaving the White House

Tech Insider : Politics, Politics, Business
Barack and Michelle Obama moved to a mansion in Washington, DC, after leaving the White House.
Barack and Michelle Obama moved to a mansion in Washington, DC, after leaving the White House.

Redfin ; White House Pool/Getty Images

New York City's narrowest home is on the market for $4.195 million — and it's only 9.5 feet wide

Tech Insider : Business
A famously narrow townhouse at 7 1/2 Bedford Street.
The townhouse at 7 1/2 Bedford Street.

Joey Hadden/Business Insider

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