• Cash only at the gate, so bring coins and small notes for the entry fee
• Free parking at Luxemburger Schloss, about 300 meters from the castle entrance
• Knights' tournament every spring on the weekend after Ascension Day, when the castle grounds fill up

Burg Königstein is one of the largest fortress ruins in Germany, a castle that guarded the Frankfurt to Cologne road until French troops blew it up in 1796. Kids walk in through the Mainzer Tor, explore the walls, towers and vaulted rooms, and look out over the Rhine-Main plain and the Taunus forests.

The 3BurgenWeg trail links it to the castles at Falkenstein and Kronberg.