📜 The Old Observatory of Leiden is the oldest university observatory in the world, built in 1860 by Frederik Kaiser. 🔍 It houses four antique telescopes, some dating back to 1838, all still in working order. # Why Go 🔭 Explore a historic center of astronomy in the Netherlands. 🏛️ Admire architecture modeled after a Russian palace. 🌌 Witness demonstrations with ancient, functional telescopes. 📚 Learn about the rich history of astronomy. 🌳 Located within a botanical garden. 📚 Visit a unique site that also functions as a law faculty building. # Tips 🗓️ Free entry on Wednesdays and weekends (11-5) via Hortus Botanicus. 🌟 Look out for monthly open evenings with lectures and telescope viewing. 🚶 Walk-in tours available; private tours can be arranged. ✨ New "Plants & Planets" exhibition in the Visitor Center from Feb 7, 2025. # Cost 💰 Free entry on Wednesdays and weekends (11-5). Monthly open evenings €5. # Hours 🕒 Visitor Center open Wednesday, Saturday, Sunday 11:00-17:00. Guided tours Wednesday-Sunday 14:30-15:30. Also open during holidays, special astronomy events, and monthly open evenings.