This church is named for one of the most dramatic tales in the early Christian church.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

A famed artist's inspiring work of peace and tolerance.

While you wait to cross the street at a traffic light in Mainz, you might notice that the light is staring back at you.

The final resting place of the famed German pilot, the "Red Baron."

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

The narrowest street in Paris.

This overlooked courtyard and museum celebrate Benjamin Franklin's life and achievements.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

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

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

The hallucinogenic center of the ancient world.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Legend says this sacred tree was a gift from goddess Athena.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The larger-than-life art installation at Tampa International Airport welcomes travelers to town.

A 246-foot-high revolving restaurant rises unexpectedly from a forested Finnish hilltop.

This futuristic German television spire is actually the world's largest digital clock.