Seattle Central Library

The Seattle Central Library is the best free building in the city and one of the most important works of architecture of the early twenty-first century. Designed by Rem Koolhaas and the Office for Metropolitan Architecture with the Seattle firm LMN, it opened in 2004 and immediately became a destination: a faceted glass-and-steel volume wrapped in a diamond-pattern grid, its floors stacked and shifted like a set of offset platforms, so the building looks different from every block. Inside, the ideas are as striking as the shape. The Books Spiral carries the nonfiction collection up a continuous gently sloping ramp through four floors, so the whole Dewey Decimal sequence reads as one unbroken path. The fourth floor, the Red Floor, is a curving maze of meeting rooms and corridors painted a deep, almost surreal red that photographers adore. The Living Room on level three is a vast, light-filled public lounge under the slanted glass, and the tenth-floor reading room at the top looks out through the glass skin over downtown and Elliott Bay. The fluorescent yellow-green escalators add to the experience. Crucially, it is a working public library, busy with readers, students and people using the computers, so visit respectfully — keep voices low, photograph without disrupting anyone, and avoid groups blocking the walkways. It is open daily, with later hours midweek, and the library offers free self-guided tour materials in several languages. A visit takes forty-five minutes to an hour. Fit: architecture lovers, rainy days, couples looking for a free indoor wander, and first-timers exploring downtown on foot.

The library replaced an older modernist building on the same block and was part of a citywide bond program that rebuilt Seattle's libraries. Koolhaas's team started from the question of what a library should be when information is everywhere, and answered by separating the building into stable platforms for fixed functions — offices, the book collection, parking — and open in-between zones for the unpredictable public life of a library. The diamond-grid skin, which also helps brace the building against earthquakes, wraps those shifted floors in a single folded envelope. Critics praised it as a bold civic statement on its opening, and two decades later it remains one of the most visited buildings in the city.

Working a visit: enter from Fourth Avenue and take the escalators up rather than the elevators, because the slow reveal through the floors is the point. Stop at the Living Room on level three, go up to the Red Floor on level four for the corridors, then continue to the Books Spiral and ride or walk its ramp before finishing at the tenth-floor reading room, where the slanted glass and the city views make the best photographs. Pick up a self-guided tour sheet or download one from the library's site for background on the design. Mornings on weekdays are quietest.

Practicals and fit: the library is at 1000 Fourth Avenue downtown, a few minutes' walk from Pike Place Market, the Seattle Art Museum and the light rail tunnel stations. It opens daily, typically from mid-morning into the early evening, with longer hours Tuesday through Thursday, and closes for major holidays. There is paid underground parking, a coffee cart and public restrooms. Admission is free. If you want to go deeper, the library publishes self-guided tour sheets and an audio tour describing the design ideas floor by floor, and the building is a short walk from Benaroya Hall, so it pairs well with an afternoon downtown before a concert. Fit: architecture and design lovers, rainy-day plans, couples, solo travelers and anyone who wants a quiet hour downtown.