Discover the story of stonework in S.B. this summer during Casa De la Guerra’s 75-minute weekly Architectural Stone Walking Tours that highlight the fascinating history and architecture of the city. Led by knowledgeable docents, these intimate group tours feature historic downtown stone architectural sites. Tours begin at 2 p.m. in front of Casa De la Guerra each Saturday through the end of July. Cost is $10 and includes admission to Casa De la Guerra and the Presidio. Call 964-6688 for more info.