Dramatic river bend surrounds a natural red-rocked pedestal.

A church of bones, decorated with 40,000 human skeletons.

The sign at the garden gate reads: "These Plants Can Kill."

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

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

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

Most-visited and most-photographed slot canyon in the American Southwest.

World's first "penitentiary," meant to be humane, drove men insane.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Rippling sand dunes frozen in the Arizona rock.

An exquisite tunnel of cascading flowers.

On Japan's Tashirojima Island, cats are king.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The United States Capitol's former columns still stand.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.