If there's room in your travel plans for activities ranging from a guided tour of the world's second largest particle accelerator to a behind-the-scenes tour of Alcatraz, then Obscura Day, on Saturday, April 28, is for you.
If there's room in your travel plans for activities ranging from a guided tour of the world's second largest particle accelerator to a behind-the-scenes tour of Alcatraz, then Obscura Day, on Saturday, April 28, is for you.