The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

At 207 feet, one of the world's longest continuous escalators.

A building so large that it has its own weather.

The short-lived history of a new republic and British control in West Florida.

Meet manatees face-to-face at this zoo for native species.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

Deep scars on the earth left by the Ice Age.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

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

A gothic church spire sits atop this skyscraper, the tallest church in the world.

An antiquated German apothecary on Chicago's North Side.

Where Cusack's record store from the film "High Fidelity" was located.

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

Former bath house turns gastropub.

Orthodox church partially financed by Tsar Nicolas II.

Huge abstract sculptures of the Puerto Rican Flag.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

A science teacher's dream.

Nuclear reactor created the plutonium used on Nagasaki.

World's second largest particle accelerator, where nature reveals its secrets.

Remember that scene in the Matrix, when Neo is in the big white room with all the weapons flying by? Well, this is what it would look like if he had wanted trees instead of guns.

This massive redwood tree has a hole in the base big enough to drive through.