Micro-nation based around a nine-story high illegally built tower.

These huge stone ovens in the desert fueled the Nevada silver boom, and may have also been a hideout for outlaws.

The ruins of this Alaska gold mine form a gorgeous ghost town.

Nimrod Polar Expedition base, and home to hundred-year-old frozen whisky.

A hidden subterranean installation offers a view of the sky.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

Today this bizarre rooftop phone booth seems like a piece of kitsch but it was once used to spot disastrous storms.

This tiny historic jail along Route 66 is the perfect fit for exactly one criminal and their partner-in-crime.

Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

Cold War missile launch site which has been converted to a public park.

Nonprofit art center that promotes outsider, intuitive, and self-taught art.

The world's third-largest scale model of the planets.

This library and museum is dedicated to the life and literature of the Indianapolis native author.

Literally a million fascinating cartographic artifacts are held in this sprawling university collection.

Largest sub-glacial lake ever discovered.

This derelict superstructure was a very important warning system for the Soviet military.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

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

Appropriation-friendly collection of books, periodicals, and more.

Nuclear waste dump site now an environmental sanctuary.

Radioactivity still cause for concern at this urban explorer's paradise.

27-room home built with the fortune of a sugar magnate.

A modest reminder of treacherous waters at the Golden Gate.