PORTLAND, Maine (AP) — A popular science center that has attracted traveling exhibits to Maine's largest city is closing its doors.

The Portland Press Herald reports the Portland Science Center is shutting down after nearly three years on the city's waterfront. The center has featured exhibits about subjects such as sharks, pirates and the Titanic.

The owner of the building where the center had been located says the center's Massachusetts owner, the Gold Group, has opted out of its lease. The center's last exhibit was "Planet Shark," which opened in February and closed this month.

The center was a for-profit business that hosted about two exhibits a year.