В настоящем: They seem to be more real and less comercial
В будущем: If you want to see sea animals performances, you'll have to go yo another kind of circus: the Moskow Dolphinarium
В прошедшем: 1. It was opened in 1880 and since that time has been working nonstop(even during the Great Patriotic War)
2. In 1980s,the circus was rebuilt, but the atmosphere of the Old Circus remained the same: warm and homelike