Remnants of a quarry company town still stand on the banks of the Wapsipinicon River.

A serene space tucked amid the skyscrapers of Hong Kong's bustling financial district.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

A grandiose octagonal home crowned by a large dome stands out among the antebellum mansions.

The gravestone of the suffragist leader attracted extra visitors during the 2016 election.

Decades before the scandal, this staircase on the river was a literal "water gate."

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The most photographed house in Maine looks good enough to eat.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

An extraordinary "City of Caves" carved from solid stone.

This Gothic-style church is reputedly built atop the remains of one of Jesus's apostles.

Picnic on the seashore in the footsteps of ancient kings, protected by giant mythical cat beasts.

This precariously balanced boulder is said to be a hunk of stolen butter dropped by the gods.

This experimental utopian "city of the future" in rural India may hold a dark secret.

Modest by day, illuminated majestically at sunset.

Millions of dollars worth of sculpture decorate this Iowa city center.

The “American Gothic" artist's largest works hang in an Iowa State University library.

The "feral child" who appeared in Bavaria in the 19th century remains as much a mystery as his unsolved murder.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

The footprint of a frustrated devil in Munich's Cathedral.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

Daily jousts and dancing barrel makers in Munich's mechanical clock.