North Carolina's The Umstead Spa, US, will close for refurbishment from 1 April, with new features to include a heated whirlpool under an open roof and new textiles and artwork.

During the three-month project the 14,000sq ft (1,301sq m) spa, which spans two floors, will gain an additional 1,400sq ft (130sq m), with a new co-ed wet lounge, relaxation room and an additional treatment room - taking the total number to 11.

The introduction of natural elements such as river rock, granite and glass aims to connect spa-goers with nature.

Guests will be able to relax in the wet lounge's spa pool, which has 12ft (3.7m) walls opening up to the North Carolina sky.

All treatment rooms will be refurbished and fitted with new massage tables, facial machines, furnishings and fixtures, and three couples' rooms will feature a private deep soaking tub.

The nail salon will be further integrated into the spa with two manicure stations added and four pedicure stations with Lenox DS Pedicure Chairs.

The expansion comes as the hotel refreshes its public areas, rooms and suites.