"Holy Wisdom" overlooks the city that became its namesake.

A 125-meter long "tribute to the Brazilian people."

Eduardo Kobra’s breathtaking 32,300-square-foot graffiti wall took over Rio’s Olympic Boulevard.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

Hidden beneath a restaurant, underground tunnels tell the story of Malta’s tragic role in World War II.

This almost-forgotten underground dungeon housed several convicts over the years, including Caravaggio.