Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

The first declared National Monument in the United States.

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

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

The world's largest man-made underground caverns offer unparalleled underwater wonders.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

In this century-old literary safehouse, print is alive and well.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

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

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

Giant wind turbine with observation deck at the very top.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

An elevator into the Baltic Sea.

This "floating railway" is one of the world's oldest monorail systems.

Few other hotels can rival the grandeur of the Castle in the Rockies.