There are several pairs of houses that share similar architectural styles or designs, but one famous example of somewhat identical houses is the "Mirror Houses" located in the Swiss Alps.
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Mirror Houses: Designed by architect Hansjürgen S., these two homes use reflective glass exteriors that blend into the mountainous landscape. They are visually symmetrical and share a similar layout and design but are constructed to align with the natural terrain, making them appear nearly identical.
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The Levittown Homes: In Levittown, New York, many homes were built in the 1940s and 1950s as part of a massive suburban development project. The houses in Levittown often feature similar floor plans, facades, and styles, specifically the Cape Cod and Ranch-style homes. While there may be slight variations in design and color, the overall structure remains quite uniform, making many homes appear nearly identical in street views.
These examples illustrate how architecture and design can lead to somewhat identical houses in specific contexts.