These concrete dome-shaped structures may look futuristic, but they're actually just the vacation home of a retired oil producer.

Bob Lee built the dome homes in 1981 as an environmentally friendly and self-contained getaway for his family on Marco Island, Florida.

While the pods once stood on their concrete pylons right on the beach, erosion has resulted in their current location in the ocean. While unlivable today, the igloo-like structures are still standing right off the coast of Marco Island.