10 Things to See in Frankfurt (Besides the Airport): The Römerberg
5 Quick Things To Do In Frankfurt, Germany - California Globetrotter
Fleming’s Rooftop Bar
I wish I had this guide before I went to Frankfurt!
Maxie Eisen, in Bahnhofsviertel. Frankfurt, Germany
How easy is it to visit Frankfurt during your layover? It's actually very easy, AND totally worth it.