The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

A sculpture outside London's oldest cathedral honors the Mohegan chief who died while petitioning the king.

These four islands right offshore have waterfalls, colorful lights, fancy buildings, and a secret purpose.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Visitors flock to see this church tower's unintended feature: It happens to resemble a giant chicken from multiple points of view.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

An enigmatic modern marker left next to a historic Roman site.

The world's largest fire hydrant is supposedly tornado-proof.

Henry VIII's forgotten castle was built by the gunpowder-obsessed king to be defended solely by cannons.

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

The Pope’s secret escape route.

A hidden treasure of an abandoned city lies deep in the jungles of Campeche, Mexico.

This smaller cousin of the Forbidden City has gone from ancestral sacrifice to tourist's whispers.

A Masterpiece with a Tragic History.

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

A visionary, futuristic sculpture in Los Angeles that never met its extraterrestrial potential.

A beautiful geyser under environmental threat.

This geothermal hot spring hides beneath a slowly growing mineral dome.

A contemporary art installation housed within a Gothic cathedral.