[Answer] What unusual feature lies underneath the U.S. Capitol?

Step 1 : Introduction to the question "What unusual feature lies underneath the U.S. Capitol? "

...1. A research lab 2. A freshwater spring 3. A secret bunker 4. A private subway station

Step 2 : Answer to the question "What unusual feature lies underneath the U.S. Capitol? "

A private subway station - Think you know the country’s most famous landmarks inside and out? Many of the most famous buildings in the U.S. have a hidden set of features that most people never encounter. The U.S. Capitol Building is just one such example. Hiding beneath the Capitol is a private subway station for members of the government. It’s part of a special subway system that dates back to 1909, when it was created to transport politicians between the Capitol Building, the Senate, and the House of Representatives. The system is still in use today. While it’s usually restricted to only government officials, members of the public can ride the subway during special tours of the Capitol complex.:

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