Construction is well underway for KPF's Lotte World Tower in Seoul, however the mysterious appearance of sinkholes in the surrounding area - as reported by CNN - has brought on a slew of safety concerns. Authorities have been unable to determine the cause of the sinkholes which have appeared in a number of locations around Seoul's Songpa District, although they have ruled out sewerage as a possibility. To learn more about the bizarre phenomenon putting the 123-story tower under scrutiny, click here.
