A miscalculation turns a very shallow freshwater lake into a very deep saltwater lake.

This unusual piece of Renaissance art depicting the bodily horror of crucifixion and skin disease may have been inspired by fungus-induced hallucinations.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

A statue honoring 44 continuous years of greeting passing ships.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

A huge enchanting public park just outside the ancient walls of Rome.

This historic recreationist school churns out warriors that may very well have had a fighting chance in Rome's pits of the day.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.