In sport, facilities and venues that are underutilized or abandoned after a sporting mega event are often called:

Name: In sport, facilities and venues that are underutilized or abandoned after a sporting mega event are often called:
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White elephants refer to facilities and venues that are underutilized or abandoned after a sporting mega event, often because they are too expensive to maintain or were not designed for long-term use.

In Sport, Facilities and Venues That Are Underutilized or Abandoned