Vatican Grotto, Tombs in Vatican City
The Vatican Grottoes are a vast underground graveyard beneath St. Peter's Basilica.
They contain the tombs of many Popes and are located on the site of the Circus of Nero, where Saint Peter is believed to have been crucified.
The grottoes are considered sacred due to their connection with Christianity's most important figures.
Visitors can explore the grottoes through guided tours offered by the Vatican.
The tomb of Pope John Paul II, one of the most visited sites, is located here.
Location: Vatican City
Source: Wikimedia