The Surfside condo that collapsed was vulnerable to sinking earth, engineers say. Your house might be too.

In 1981, a sinkhole in Winter Park opened up gulping down 250,000 cubic yards of soil, five Porsches at a foreign car repair shop, the deep end of an Olympic-size swimming pool, chunks of two streets and a three-bedroom home. Picture taken May 11, 1981. (Red Huber, Orlando Sentinel file) (Orlando Sentinel)