A bit of retro transportation flair preserved in the world's largest department store.

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

These sacred Mesoamerican ruins feature peculiar petroglyphs hidden in the stones.

The first mosque in the world to receive electricity.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

The tallest building in the Republic of the Congo is a source of pride despite its towering maintenance costs.

One of the now-less-hidden floral gems of the "Emerald Necklace."

A monument to the art of slicing people open.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

In Zanzibar, a historic 19th-century palace is a reminder of the world's shortest war.

On holy holidays, Israel's second president used this room atop Mount Zion as a refuge to read the Torah.

Two thousand artifacts from around the world collected by one woman who loved to travel.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

This supermarket is suspended 25 feet above an interstate highway.

A free, public museum dedicated to the fascinating science of sight.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

The self-proclaimed world's smallest museum, located next to a Massachusetts sandwich chain.

This hidden sculpture garden full of Wild West art is one of San Antonio's best-kept secrets.