The hub of Seattle's 27-branch library system is a stunning jewel of a building that stands out against the concrete jungle of downtown. Designed by renowned Dutch architect Rem Koolhaas and Joshua Ramus, this 11-story structure houses more than 1 million books, a language center, terrific areas for kids and teens—plus hundreds of computers with Internet access, an auditorium, a "mixing chamber" floor of information desks, and a café. The building's floor plan is anything but simple; stand outside the beveled glass-and-metal facade of the building and you can see the library's floors zigzagging upward. Tours are self-guided via a laminated sheet you can pick up at the information desk; there's also a number you can call on your cell phone for an audio tour. The reading room on the 10th floor has unbeatable views of the city and the water, and the building has Wi-Fi throughout. Readings and free film screenings happen on a regular basis; check the website for more information.