Two U.S. tourists were arrested by authorities in Italy after defacing the historically significant Colosseum Amphitheater in Rome. The two American women were reported by other tourists on March 9th, having been caught carving their initials into a wall with a coin.

According to a daily Italian newspaper entitled La Stampa, two letters, about eight centimeters in length, were scratched into a brick wall at the amphitheater by the two American women. The women, ages 21 and 25, also posed for a selfie with their handiwork.

According to CNN.com, Italian officials asserted that the women are likely to face charges for “aggravated damage” on a building of historical and artistic interest.

However, this is not an isolated case, as many arrests have occurred due to the vandalization of this landmark by tourists. The Colosseum lures almost 5 million tourists annually, and among these, five arrests were made in 2014. Those arrested were with charges surrounding the defacement of the amphitheater—an offense which is strictly forbidden by law and punishable by fine.

Among the five arrested in 2014, one Russian man was charged with “aggravated damage” for carving his initials into the brickwork of the Colosseum in a similar manner to that of the American women. He was charged a €20,000 penalty—an American equivalent of $21,685—and it is presumed that the American women will face a similar fate.

“The Russian was the fifth person to be stopped for defacing the ancient monument last year, with others hailing from Australia, Brazil and Canada,” claimed The Guardian. It certainly won’t be the last incident, as security cuts at various historical landmarks in Rome have made it difficult for tourists to be constantly supervised.

Having fallen into disrepair since it’s completion in AD80, the Colosseum was restored in the 1800s in an effort to preserve its historical integrity. It was upon this section of refurbished structure that the two American women managed to scratch their initials into the stone.

As reported by The Guardian, a spokesman for the Special Superintendency for the Archaeological Heritage of Rome claimed that “It’s not an original wall but it’s nevertheless antique,” and thus an adequate penalty should be bestowed upon the women.

The Colosseum, as a cultural symbol, is undoubtedly susceptible to the millions of tourists who wander the ancient landmark hoping to leave a piece of their identity on the world-renowned structure. However, this minority will justly end up like the two American women who may have taken the most expensive selfie in history.