Four Seasons Hotel Philadelphia at Comcast Center.

Floating on the 57th floor of the Comcast Technology Center, this sanctuary replaces traditional hotel-spa aesthetics with a dedicated crystal-healing concept. Architect Norman Foster and artistic director Jeff Leatham integrated over 700 pounds of crystals into the walls, creating a high-altitude retreat where Philadelphia’s skyline serves as a constant backdrop. Each of the seven treatment rooms is themed around a specific chakra, offering guests a choice between floor-to-ceiling city views or soft, internal lighting for a more secluded experience. Beyond the signature crystal sound baths and anti-pollution journeys, the wellness floor features an indoor infinity-edge pool holding 30,000 gallons of water and a 24-hour fitness center. For a rare city experience, the Night Spa allows for private, candlelit pool access until 1:00 a.m., complete with champagne and roses.