You want to visit one of Frankfurt's many cultural institutions on Whitsun or on Frankfurt's national holiday, the "Wäldchestag"? Then you can find an overview of all opening hours here:
Archaeological Museum, Karmelitergasse 1
Whitsun Sunday: 10 am - 6 pm
Whitsun Monday: 10 am - 6 pm
Wäldchestag: 10 a.m. - 6 p.m.
Bible House on Museum Embankment - Adventure Museum, Metzlerstrasse 19
Pentecost Sunday: closed
Pentecost Monday: closed
Woodchest Day: 10 am - 5 pm
caricatura museum frankfurt (Historisches Museum branch), Weckmarkt 17
Whitsun Sunday: 11 am - 6 pm
Whitsun Monday: 11 am - 6 pm
Whitsun Day: 11 a.m. - 6 p.m.
German Museum of Architecture, Schaumainkai 43
Pentecost Sunday: 11 a.m.-6 p.m.<x><N</x>Whitsun Monday: 11 a.m.-6 p.m.<x><N</x>Whitsun Day: 11 a.m.-6 p.m.<x><N</x>German Film Institute e.V. - Deutsches Filmmuseum, Schaumainkai 41
Whitsun Sunday: 10 am - 6 pm
Whitsun Monday: 10 am - 6 pm
Whitsun Day: 10am - 6pm
Dommuseum Frankfurt, Domplatz 14
Whitsun Sunday: 11am - 5pm
Whitsun Monday: 11am - 5pm
Whitsun Day: 10 a.m. - 5 p.m.
Photography Forum Frankfurt I , Braubachstraße 30-32
Pentecost Sunday: 11 a.m. - 6 p.m.
Pentecost Monday: closed
Woodchest Day: 11 am - 6 pm
Frankfurt Art Association, Markt 44 / Steinernes Haus
Pentecost Sunday: closed<x><N</x>Pentecost Monday: closed<x><N</x>Waldchestag: closed<x><N</x>Money Museum of the Dt. Bundesbank, Wilhelm-Epstein-Str. 14
Pentecost Sunday: 9 a.m.-5 p.m.
Pentecost Monday: 9 a.m.-5 p.m.
Waldchestag: 9 a.m.-5 p.m.
Goethehaus, Grosser Hirschgraben 23
Whitsunday: 10 a.m.-5 p.m.
Whitsunday.30 a.m.
Pentecost Monday: 10 a.m.-5 p.m.30 a.m.
Woodchest Day: 10 a.m. - 1 p.m.
Hindemith Cabinet in Cowherd Tower, Grosse Rittergasse 118
Whitsun Sunday: 11 a.m. - 6 p.m.
Whitsun Monday: closed
Waldchestag: closed
historisches museum frankfurt, Saalhof 1 (Römerberg)
Pentecost Sunday: 11 am - 7 pm
Whitsun Monday: 11 am - 7 pm
Whitsun Day: 10 a.m. - 6 p.m.
porzellan museum frankfurt (Historisches Museum branch), Bolongarostraße 152
Pentecost Sunday: 11 a.m. - 6 p.m.
Pentecost Monday: 11 a.m. - 6 p.m.
Waldchestag: Closed
Icon Museum, 3-7 Bridge Street
Whitsun Sunday: 10 a.m. - 5 p.m.
Whitsun Monday: Closed
Whitsun Day: closed
Institute for Urban History / Archive u. Lesesaal, Münzgasse 9
Pentecost Sunday: closed
Pentecost Monday: closed
Waldchestag: 8.30 - 12 p.m.
Institute of Urban History / Exhibition, Münzgasse 9
Pentecost Sunday: closed
Pentecost Monday: closed
Waldchestag: 10 am - 6 pm
Jewish Museum, Untermainkai 14 - 15
Pentecost Sunday: Closed
Whitsun Monday: closed
Whitsun Day: closed
Young Museum Frankfurt (in the Historical Museum), Saalhof 1
Whitsun Sunday: 11 am - 7 pm
Whitsun Monday: 11 am - 7 pm
Whitsun Day: 10 am - 6 pm
Cinema at the Deutsches Filminstitut e.V. - Deutsches Filminstitut, Schaumainkai 41
Pentecost Sunday: open
Pentecost Monday: open
Whitsunday: open
Kunsthalle Schirn, Am Römerberg 6a
Whitsunday: 10 am - 7 pm
Whitsun Monday: 10 am - 7 pm
Whitsun Day: 10 am - 7 pm
Liebieghaus, Schaumainkai 71
Whitsun Sunday: 10 am - 6 pm
Whitsun Monday: 10 am - 6 pm
Whitsun Day: 10 a.m. - 6 p.m.
Museum of World Cultures, Schaumainkai 29
Whitsun Sunday: 11 a.m. - 6 p.m.
Whitsun Monday: Closed
Whitsunday: 11 a.m. - 6 p.m.
Museum of Applied Arts, Schaumainkai 17
Whitsunday: closed
Whitsun Monday: closed
Whitsun Day: Closed
Museum of Communication, Schaumainkai 53
Whitsun Sunday: 11 a.m.-7 p.m.
Whitsun Monday: 11 a.m.-7 p.m.
Whitsun Day: 9 a.m.-6 p.m.
MMK 1 Museum of Modern Art, Domstrasse 10
Whitsun Sunday: Closed
Whitsun Monday: closed
Whitsun Day: closed
MMK 2 Museum of Modern Art, Taunustor 1
Whitsun Sunday: 11 am - 6 pm
Whitsun Monday: 11 am - 6 pm
Whitsun Day: 11 a.m. - 6 p.m.
MMK 3 Museum of Modern Art, Domstrasse 3
Whitsun Sunday: closed
Whitsun Monday: Closed
Whitsunday: closed
Museum Giersch of Goethe University, Schaumainkai 83
Whitsunday: 10 am - 6 pm
Whitsunday: 10 a.m.-6 p.m.
Waldchestag: 12 p.m.-7 p.m.
Museum Judengasse, Kurt-Schumacher-Straße 10
Pentecost Sunday: 10 a.m.-6 p.m.
Pentecost Monday: Closed
Woodshed Day: 10 am - 8 pm
Naturmuseum Senckenberg, Senckenberganlage 25
Pentecost Sunday: 9 a.m. - 6 p.m.
Whitsun Monday: 9 a.m. - 6 p.m.
Whitsun Day: 9 a.m. - 5 p.m.
Palmengarten, Siesmayerstrasse 61 / Palmengartenstrasse
Whitsun Sunday: 9 a.m. - 6 p.m.
Whitsun Monday: 9 a.m. - 6 p.m.
Woodshed Day: 9 a.m. - 6 p.m.
Portikus, Old Bridge 2 / Main Island
Whitsunday: 11 a.m. - 6 p.m.
Whitsunday: Closed
Waldchestag: 11 am - 6 pm
Städelsches Kunstinstitut, Schaumainkai 63
Pentecost Sunday: 10 a.m.-6 p.m.
Whitsun Monday: 10 a.m.-6 p.m.
Whitsun Day: 10am - 6pm
Stoltze Museum, Toengesgasse 34-36
Whitsun Sunday: closed
Whitsun Monday: Closed
Whitsunday: Closed
Struwwelpetermuseum, Schubertstraße 20
Whitsunday: 10am - 5pm
Whitsun Monday: 1pm - 5pm
Woodchest Day: 10 a.m. - 5 p.m.
Transport Museum Frankfurt am Main, Rheinlandstraße 133
Pentecost Sunday: 10 a.m. - 5 p.m.
Pentecost Monday: 10 a.m. - 5 p.m.
Waldchestag: Closed
Frankfurt Zoo, Bernhard-Grzimek-Allee 1
Pentecost Sunday: 9am - 7pm
Whitsun Monday: 9am - 7pm
Whitsun Day: 9am - 7pm