These small, brass stones commemorate the first Roma victims of the Holocaust.

The best-preserved ancient theater in the world.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

An archive of ceramic eggs painted to record clowns' personal makeup designs.

A measuring mishap led to these artificial stone ladies losing their stomachs.

The sculpture of the deceased cockatoo flops atop its personal plinth.

These morbid carvings remind churchgoers of the inevitability of death.

Black cat statues guard this temple-like Egyptian revival factory.

This home on a quiet suburban street is completely covered with vibrant mosaics.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

This London plaque marks the spot where David Bowie's famous alien made his debut.

An artistic tribute to the famous singer, just around the corner from where he was born.

The television series' iconic giant foot was borrowed from this classical painting.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

The Pope’s secret escape route.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The underground sanctuary of a mysterious ancient cult.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The social hall of this former factory is a Communist-era time capsule.

This mural painted by Keith Haring was done without payment as a gift to entertain the children at the Hôpital Necker.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

This museum in a Paris apartment gives a unique look at the iconic French singer's life.