14 NYC Secrets Even New Yorkers Don&#39;t Know #refinery29 http://www.refinery29.com/secret-hidden-spots-nyc#slide1 Bowling Alley Beneath The Frick Gilded Age industrialist Henry Clay Frick is best known for his exquisite collection of Old Master paintings and French decorative arts. Walking through the Fifth Avenue museum in his former mansion, you&#39;re more likely to imagine masquerade balls than bowling balls, but hidden in the sub-basement lies Frick&#39;s private bowling alley. Obviously not ...