U.S. AIR FORCE ACADEMY, Colo. — The most-visited man-made attraction in the state will be temporarily closed starting next year.

The Air Force Academy Cadet Chapel will be shutting its doors in June 2018 for much-needed repairs. The chapel is expected to be closed for three or four years.

The iconic structure has leaked since it was built in 1963.

The aluminum siding on the outside, the panels on the inside, and all of the glass will be repaired. The glass will be replaced with high-efficiency glass, with the exception of the stained glass, which will remain the same.

Matthew Deutsch, an instructor of engineering mechanics at the AFA, said it’s an exciting time for his class. While the repairs are being made, his class can see the building’s structure and learn from it.

As for cadets who go to the chapel, there are alternate plans in place to accommodate worship services. Buildings not normally used on the weekends, including classrooms and auditoriums, will be utilized.

The project is slated to cost upwards of $68 million.

While renovations are underway, visitors can still see the chapel’s inside through a video tour experience.