The Alte Oper, or Old Opera House, is a concert hall and former opera house located in the center of Frankfurt, Germany. It was originally built in 1880 by architect Richard Lucae in the style of the Italian Renaissance, but was heavily damaged during World War II and subsequently rebuilt in the 1970s.

Today, the Alte Oper is one of Frankfurt's most important cultural institutions, hosting a wide range of concerts, operas, ballets, and other performances throughout the year. The concert hall has a capacity of around 2,500 seats and features a state-of-the-art sound system and acoustics.

In addition to its main concert hall, the Alte Oper also features several smaller performance spaces, as well as a restaurant and a terrace with views of the city. The building's architecture and ornate interior decorations are also a major draw for visitors, with features like its grand staircase, chandeliers, and intricate frescoes and murals.

The Alte Oper has played an important role in Frankfurt's cultural history, hosting many notable performances over the years and serving as a symbol of the city's resilience in the face of war and destruction. Today, it continues to be a beloved institution and a cultural hub for both locals and visitors alike.