The Opera House is not a fairly new building. It is 90% original. They put a new roof on it, just like they put a new roof on the Kaiserdom.
Trip Advisor is selling Viator tours and none of the decent tour operators in Frankfurt sell their tours with Trip Advisor/Viator as they don't want to pay the 30% commission, nor be associated with the crappy tours they DO sell.
This is my list of things that one should see in Frankfurt. And please do NOT do the walk through Frankfurt that Ricks posts in his book. It is awful and makes me cringe.
- The Roemer and the Römerplatz, City Hall and old town square
- The New Alt Stadt, including Frankonoford archeology
- Book Burning Memorial, site of the Nazi book burning, 10 May, 1933
- Alte Nikolai Church, Gothic church built in 1290
- St. Leonhards, built in 1219, stop on the Camino route that goes through Frankfurt
- House Wertheim, the inner city's only original half-timbered house left at the end of WWII
- Eisener Steg, pedestrian bridge on the Main River, covered with Love Locks, & offering a great view of the skyline and the many, varied museums lining the riverbanks of the Main.
- St Bartholomew, better known as the Kaiserdom. An Imperial Church and site for the elections (1356) and coronations (1500's)of the Holy Roman Emperors
- Joerg Ratgeb's wall paintings in the Karmeliter Kloster (Carmelite Cloister), the largest religious wall paintings north of the Alps, painted in the early 1500's (closed on some holidays)
- Stumble Stones (Stolper Steine), a sobering way to commemorate the many victims who lost their lives under the Nazi regime
- Jewish Holocaust Memorial Wall, a very personal memorial that the city of Frankfurt has created, to honor the memory of the 12,000 Frankfurt Jewish Citizens who lost their lives during the Holocaust, including Anne, Margot and Edith Frank
- Medieval Jewish Cemetery on Batton Str., one of the oldest and largest Jewish cemeteries in Germany
- Jewish Ghetto Wall, (Staufenmauer) once part of the city's defensive walls built in 1180, it later became one of the walls that surrounded the 1st Jewish Ghetto in Germany
- Klein Markt Halle (little market hall), a tour favorite, this is a wonderful market hall filled with fruits, vegetables, chocolates, pastries, cheeses, breads, meats, fish, and delicacies from around the world (closed on Sundays and holidays)
- Eschenheimer Turm, an original guard tower from the city's outer defensive wall, built early 1400's
- Alte Oper, one of Europe's classic opera houses(1880)
- The Goethe House, where Frankfurt's' favorite son was born
- The Frankfurt City Model at the City Planning Office (not on weekends & holidays)
- Paulskirche, the location of Germany's very first democratically elected parliament in 1848
- Farmers Markets at the Konstablerwache, Schillerstrasse, Bergerstrasse, Höchst
- Deutsche Ordenkirche, (Teutonic Order of Knights) built in 1309.
- The Judengasse Museum, unique for having 5 of the original cellars of the Jewish Ghetto, 1462-1800
- November 9th Initiative, located in an old bunker built on top of the ruins of Friedberger Synagogue, Jewish Ostend History
- Palmengarten, Botanical Gardens
- Städel, world-class art museum
- Other museums: Film, Architecture, Archeology, Bible, Icon, Sculpture, Applied Arts, Modern Arts, the Schirn, World Culture, Jewish Museum re-opening in Nov. with the Frank Family Center
- The Bull and the Bear & the Frankfurt Stock Exchange
- the Hauptbahnhof, built in 1888
- The Thurn and Taxis Palace, a lovely reconstruction of 18th Century Baroque architecture
- Friedberger Warte, Bockenheimer Warte, Sachsenhausen Warte, Gallus Warte - All guard towers built middle 1400-1500
I have more if you are truly interested. Rick and other guide book writers have never taken the time to actually see what is here.