To celebrate the Eiffel Tower's 125th anniversary, the Paris monument has been given quite the face lift – one that should be skipped by those who have acrophobia.

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A glass floor has been added to the 1,063-foot tower's first floor, allowing tourists to stare straight down. The four small sections, which cost $38 million to build, were unveiled to the public Monday.

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Though the first level is only 187 feet high, it's not for the faint-hearted.

One tourist from Jordan, Yousef Mobaidin, said he was "terrified. It looks really scary," gripping his friend's arm as he walked on the glass.

Aaron Smith from Hawaii admitted to getting butterflies, hoping "they did a good job building it."

The iron-lattice tower is the world's most visited paying attraction, and was erected for the 1889 World Fair.