In 1873, Mark Twain and Charles Dudley Warner dubbed their era the Gilded Age in America, characterizing the display of new wealth in America after the Civil War. Impressive homes like this one, now on the market for $50 million, were built for magnates like Andrew Carnegie, John D. Rockefeller, and Cornelius Vanderbilt at the end of the 1800s. In fact, Vanderbilt’s granddaughter once owned this mansion — the last of its kind in New York City, according to the New York Post. The six-story Beaux Arts building includes 32 rooms, with eight baths and two elevators. If you’re partial to grand entrances, there’s also a dramatic white marble staircase. The residence was built in 1905, and a wood stove from that year still remains. Plus, the property comes fully furnished, including the artwork and murals. Although $50 million may seem like a steep asking price, this home’s history truly is priceless.