The Castle Hotel & Spa in Tarrytown, New York, US, has announced the opening of its US$11m (£6.84m, €8m) Thann Sanctuary Spa.

Following an eight-month construction phase, the 8,700sq ft (808sq m) spa features seven treatment rooms and a VIP treatment suite with its own deep tub and private outdoor gazebo; separate locker facilities and steamrooms for men and women; and a women’s relaxation lounge.

Based on the art of natural treatments, Thann uses a unique holistic spa therapy developed in house, and is the first of its kind to be built in the US, with other locations based across Asia.

The spa is housed in a building of natural materials, utilising stone walls and minimal exterior opening to blend into its surroundings. The spa offers an atmosphere of quiet and privacy, supported by architectural screening, protected views, and acoustical isolation.

Treatments on offer include the signature Thann deep tissue oil massage, traditional Thai massage, facials. Nan Shiso therapy, Swedish massage and Thann Aromatherapy massage.