Located on a side street near the Arc de Triomphe, the Hidden Hotel is an eco-conscious outpost of Parisian chic, with exteriors clad in rough reclaimed wood from Canada and interiors featuring slate, wood, marble, stone, glass, and handmade ceramic finishes; bedrooms are swathed in yards of organic Libeco Belgian linen. The interiors were designed by design duo Jamie and Diane Welstead of Hidden Cabin.