This door is one of the oldest doors in the world located in the Pantheon in Rome, it was built in 118-126 AD, during the time of Emperor Adrian. The gate consists of two wings, each wing is made of solid bronze and weighs 8.5 tonnes, is 7.6 meters high and 2.3 meters wide. Although the wings are extremely heavy, they are so balanced that they can be easily opened and closed by a single person. It’s also one of the few doors in the world whose lock, dating back almost 2000 years ago, still works.

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