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

This hydraulic power system in London was, at one time, seen as a rival to electricity and the last of its kind to shut down.

Where condemned pirates met their grisly end at the gallows on the River Thames.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

The plunge pool is a surviving relic of a rowdy royal residence.

Dedicated to the American general whose reply to a German demand for surrender was simply "Nuts!"

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

A former ironworks that was the first UNESCO industrial site.

A Faraday Cage protects cars from a nearby high-power transmitter.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A statue honors the children who fought Nazis in Poland.

Warsaw's fantastically preserved gasworks...almost.

The city of Parma's cathedral is home to one of the greatest illusionistic frescoes of the Renaissance.

Stuck in the arcade of Casa Isolani are three arrows of mysterious origins.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

A gorgeous example of 13th-century Gothic architecture.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

Pilgrimage site for star-crossed lovers.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.