If you’ve visited Spa Castle in Queens, then you know why we’re pumped about this Manhattan location, which opened in late 2014. Occupying floors seven, eight and nine in a midtown building, Spa Castle Premier 57 is the ultimate relaxation mecca. The shoe-free facility (you’ll still have to wear those odd T-shirt/shorts uniforms) features "Sauna Valley," an area boasting six types of rooms (including cold saunas, one paved with gold—seriously—and an infrared lounge), a swim-up full service bar and a year-round roof deck. Day passes (which include access to tubs and other communal areas) are $65. Food, drinks and treatments cost extra. No one under the age of 16 is admitted.