Unknown vandals sprayed blue paint graffiti on the outer facade of the nearly 1900-year-old Roman Pantheon, where it could be read "aliens exist". As the area outside the Pantheon is not under complete surveillance, the security cameras were not useful to help find the culprits. However, the case was reported to the police who immediately launched an investigation. The Pantheon is one of the best-preserved buildings from Roman antiquity and experts are working on removing the paint from its walls.