The walls of the private dining room inside the Dylan, a 41-room hotel on the Keizersgracht canal in Amsterdam, are a revelation. Enter and you are immediately overtaken by a hue so bold and yet refined that it’s a wonder more interiors aren’t painted this color—which, by the way, is New Classic Turquoise from Trimetal. The decorators chose the shade because it was popular when the building was erected as a theater in the 17th century, and the effect is both gorgeously classic and surprisingly modern. Rooms, from $335. At 384 Keizersgracht; 800-525-4800; dylanamsterdam.com.