The Langham, Chicago

Why it's in the collection

Because sleeping inside Mies van der Rohe's last tower, with the river at the window and more than 140 works of art on the walls, is an architecture lesson you can check into.

• Occupies the first 13 floors of the 52-story former IBM Building at 330 North Wabash – Mies van der Rohe's last office building, listed on the National Register of Historic Places in 2010; the hotel opened in 2013 with 316 rooms starting just over 500 square feet.
• Travelle Kitchen + Bar, the signature restaurant with interiors by David Rockwell, cooks in a glass-enclosed kitchen beside its wine walls; the Pavilion serves afternoon tea and Travelle Lounge takes over for cocktails.
• Chuan Spa draws on Traditional Chinese Medicine in seven treatment rooms with heated stone loungers, alongside a 67-foot indoor pool.
• The Infinity Suite and the Regent Suite lead the collection, the 12th-floor Langham Club lounge comes with butler service, and more than 140 artworks hang through the hotel, chosen to sit with the midcentury modern architecture.