Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Home to items never before seen by the public.

Secret North Korean passage discovered below the world's most dangerous border.

When a massive landslide hit one of the world's tallest dams it created a tragic environmental disaster.

A library where thousands of books explain how to avoid another Great Recession.

Built during the Scottish boom in the oil industry, the village was never inhabited.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

This stately estate house features a tower covered in a bright, modern mural.

These fantastically named natural pools look like something out of a Scottish myth.

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

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

A building so large that it has its own weather.

The ghostly remains of an accidental sea.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

A domed disco abandoned since the '70s now attracts artists and explorers under its unique roof.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

This abandoned Antarctic base sits nearly unchanged since it was forsaken in the 1950s, just waiting for you to visit.