Medicinal spa created with the discharge from a geothermal energy plant.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

A beautiful geyser under environmental threat.

The fairy tale castle of the "fairy-tale king."

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This elaborate towering structure was once famed for its revolutionary height.

A monument celebrating the idea of reaching inaccessible places.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Macabre astrological automaton clock dating to the late 1400s.

Twelve plaster figures inspired by da Vinci's famed painting haunt the desert landscape above a real-life ghost town.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

The world's last remaining store of its kind.

Statues of Ramona Quimby, Henry Huggins, and Ribsy the dog in the park where their adventures "really happened."

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.