[Answer] Where is the only National Historic Landmark not on U.S. soil?

Step 1 : Introduction to the question "Where is the only National Historic Landmark not on U.S. soil?"

...1. Morocco 2. Vietnam 3. Germany 4. South Korea

Step 2 : Answer to the question "Where is the only National Historic Landmark not on U.S. soil?"

Morocco - All U.S. National Historic Landmarks are situated within the 50 states or one of the nation’s overseas territories, except the American Legation in the Moroccan city of Tangier. Morocco and the United States have a long diplomatic history — Morocco was one of the first nations to recognize the newly independent United States of America in 1777. The mansion was gifted to the U.S. in 1821. Over the years, it has served many purposes, including a museum, diplomatic residence, training center, and library. The building symbolizes friendship between the two nations, and it is the oldest diplomatic property of the United States.:

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