The second-highest train station in Europe.

A Swiss amusement park entirely dedicated to the theory of ancient astronauts.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

A historic observatory precariously perched at the "Top of Europe."

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

The middle finger of modernity.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

Madrid's last horchata kiosk is a blue-and-white beacon of refreshment.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

Secret refuge and museum of the Duke of Florence.

More than 450 years ago, an Italian nun became the first woman to paint the iconic subject.

The mummified relic of St. Antoninus.

Watch the newest land on the planet form before your eyes.

This black shoreline is made up of exploded lava particles.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

This unusual lava tube spouts seawater during high surf.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

A Hawaiian stairway to heaven—that you can't climb.

This former luxury resort in Kaua'i is now an abandoned relic.