Subterranean Escape

W‘s beauty editor loves this underground spa.

Agua Spa at the Mondrian London Hotel

This new subterranean spa offers a pore-clearing detox treatment by Barcelona’s Natura Bissé, a marine-based hydrating facial by Stockholm’s Estelle & Thild, and a Stiletto Booster foot treatment using local brands Soveral skincare and Ciaté nail lacquer.