Klementinum

The Klementinum is a massive 17th-century Jesuit complex that houses Prague's National Library and some genuinely spectacular rooms you can visit on guided tours. The 300 CZK tour takes you through the jaw-dropping Baroque Library Hall with its ceiling frescoes and ancient globes, the Meridian Hall where they've recorded weather data since 1775, and up the Astronomical Tower for panoramic views over Prague's red rooftops. You'll also see the original astronomical instruments and learn how this place operated as the intellectual heart of Bohemia for centuries.

The tour moves at a brisk pace through surprisingly intimate spaces. The Library Hall genuinely takes your breath away when you first walk in: floor-to-ceiling books, gilded details everywhere, and those famous antique globes positioned perfectly for photos. The climb up the Astronomical Tower involves 172 steps on narrow spiral staircases, but the 360-degree views from the top are worth every step. Your guide shares stories about the Jesuit scholars who lived and worked here, making the place feel lived-in rather than just pretty.

Most guides oversell this as a library experience, but it's really about the architecture and views. The actual library visit lasts maybe 10 minutes since you can't touch anything or explore freely. Book online in advance during summer since tours do fill up, especially the morning slots. Skip the expensive gift shop and spend that money on the nearby cafes instead. The tower views are genuinely better than Prague Castle's more crowded alternatives.