A self-proclaimed libertarian micro-state on a tiny bit of disputed territory between Serbia and Croatia.

The final resting place for the famed creator and narrator of "The Twilight Zone."

Green labyrinth formed by a karstic maze hidden in a preserved oak forest.

The longest enclosed pedestrian bridge in the world spans 14 lanes of traffic and six rail tracks, all while lighting up the night sky.

A mysterious, weather-beaten bus lies on the coast of Harris, enticing the curious to investigate.

FDR's Art Deco hospital tower was hopelessly inefficient.

This small town was built around a marble quarry and named after one of the most famous sources of marble in the world.

This magnificent, quirky home sits atop a literal gold mine in the middle of the Nevada desert.

This island castle contains enough secret passageways to support a season of Scooby-Doo episodes.

Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

A mysterious shape catches the eye in this 16th-century painting.

Deceased nuns were placed on stone chairs to decompose, while the surviving nuns prayed near the lifeless bodies.

The tallest bridge in California was constructed for a project that was eventually cancelled.

Edison's cast-in-place concrete houses were a failure, but way ahead of their time.

This hole formed by a glacier is the largest and best-preserved of its kind in Stockholm.

A sculpture outside London's oldest cathedral honors the Mohegan chief who died while petitioning the king.

No Gordon Lightfoot song, only a barebones monument to greed.

A waterway covered over after the Industrial Revolution has been unearthed and cleaned up, for the enjoyment of fish and humans alike.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A missing Roman legion was recreated in sculpture along a Scottish cycling route.

Brooklyn's Barkaloo Cemetery is the resting place of a scant two bodies.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

The world's first and only museum dedicated to dachshunds.

This miniature village stays behind in the Breuer Building, even as the museums around it come and go.