Dozens of residents and member of the Williams College community made their way through the brightly lit halls of the new South Science Building last week.

iberkshires.com reports the $66 million structure that's been rising off Walden Street for nearly two years was opened to the public for two hours last Wednesday evening.

The move into the new building began a few weeks ago as soon as it was certified for occupancy. The college expects to work out the kinks this summer — the summer science program has about 200 participants — and have the building ready for the fall semester.

Bronfman was built in the late 1960s, for $3.9 million at the time, but can no longer support the college's science departments. The plan is to construct two additions to the Unified Science Center with a south building on the Walden Street side and a north building where Bronfman is currently located. Both buildings will be connected by bridges to the Unified Science Center.