Like a lot of Robber Barons, Frick turned to Philanthropy later in life. Great collection. Following from internet:

Frick Collection
Museum in New York City, New York · frick.org
The Frick Collection is an art museum located in the Henry Clay Frick House on the Upper East Side in Manhattan, New York City at 1 East 70th Street, at the northeast corner with Fifth Avenue. Wikipedia
Address: 1 E 70th St, New York, NY 10021
Hours: Open today · (Thursday)10:00 am – 6:00 pm
Founder: Henry Clay Frick
Phone: (212) 288-0700
Established: 1935
Director: Ian Wardropper
Popular timesThursdays

4.3
136 Google reviews
Millionaire industrialist’s former home turned museum displaying Western European art. – Google
“I enjoyed the art collection, i could stare at a Degas or Turner all afternoon.”
“My favorite work of art is “Mistress and Maid” by Vermeer.”
“Amazing art and decorative arts.”