A beautiful geyser under environmental threat.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

"World machine" built by an untrained Austrian farmer.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

Double spiral staircases are not unheard of, but they are very rare.

Fantastic stories on a miniature railroad.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Bizarrely-painted church designed by a controversial artist.

The shell of a medieval fortress offers commanding views of the area it once protected.

Each year melting snow turns these Austrian hiking trails into scuba zones.