In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

An abandoned castle owned and ignored by Masons carries a cursed history.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A one-of-a-kind collection of a unique medium.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

A beautiful Victorian-era cemetery, complete with a miniature village.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

New York's oldest magic store.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

A hundred-year-old museum filled with giant physics toys and experiments designed by grad students.

Home to the world's largest refracting telescope and the birthplace of modern astrophysics.

Wisconsin's most celebrated export gets the royal treatment on I-94.

Above Breckenridge, a destructive mining technique sits sunken in a small pond.

A prehistoric rock shelter that's literally in someone's backyard.

A seven-story 1920s mausoleum outside Denver houses thousands of remains.

A coal fire has been burning underground here since 1896.

Two creeks flow out of either end of this canyon in opposite directions.

A stark reminder of the huge nuclear weapons plant that once stood on the site and its effect on the surrounding area.

Final resting place of a 19th century gold prospector and convicted cannibal.

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.