(DAILYMAIL) — Ten thousand scientologists are expected to descend on Clearwater, Florida this weekend for the grand opening of a ‘cathedral’ which has been under construction for 15 years.

The $145million Flag Building is a massive seven-story, 377,000-square-foot complex and the tallest building in Clearwater, which is the ‘spiritual headquarters’ of the 59-year-old religion.

The opening of the building on Sunday will mark the first time Scientologists have had a space to receive ‘Super Power’ training – a program developed by the religion’s founder L Ron Hubbard in the 1970s.

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