People skate at Rathausplatz in Vienna, Austria, on Jan. 31, 2021. Viennese Ice Dream in Rathausplatz is one of the few open-air events that remain open during pandemic restrictions. Many people enjoy this annual event since 1996. (Xinhua/Guo Chen)

People skate at Rathausplatz in Vienna, Austria, on Jan. 31, 2021. Viennese Ice Dream in Rathausplatz is one of the few open-air events that remain open during pandemic restrictions. Many people enjoy this annual event since 1996. (Xinhua/Guo Chen)

People skate at Rathausplatz in Vienna, Austria, on Jan. 31, 2021. Viennese Ice Dream in Rathausplatz is one of the few open-air events that remain open during pandemic restrictions. Many people enjoy this annual event since 1996. (Xinhua/Guo Chen)

People skate at Rathausplatz in Vienna, Austria, on Jan. 31, 2021. Viennese Ice Dream in Rathausplatz is one of the few open-air events that remain open during pandemic restrictions. Many people enjoy this annual event since 1996. (Xinhua/Guo Chen)