As museums across Beijing become accessible to the public free of charge, holders of annual and monthly tickets are getting refunds. But, one man's trash is another's treasure. Some of the used tickets are becoming popular collector's items.Starting last Monday, about 500 people per day have come to collect their refunds for long-term tickets at the Beijing Ancient Buildings MuseumAccording to the clerks at the museum, it's all very simple. Ticket holders have only to bring their IDs and the tickets for a refund. But the tickets have to be largely intact.Most people queuing for refunds are senior citizens or are middle-aged. And they applaud the free admission policy at museum facilities.While some museum goers are discarding the useless tickets, local collectors are buying many. Museums in Beijing have been issuing long-term tickets for eighteen years. There have been many changes in local facilities in that time. For some collectors, owning the complete series of long-term tickets would be regarded as a considerable achievement.