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

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

A lush oasis full of vibrant plants and striking geometric displays.

This stunning mass of ice spans 121 square miles and is still growing.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A huge musical instrument played by the ocean.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A deserted hodgepodge of experimental structures designed by nearby university students.

European castle ruins in an American state park are actually the product of death and grief.

Prayers and messages of hope decorate the ceramic tiles of this pavilion.

This cave holds a surprisingly colorful variety of geological oddities.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

Macabre astrological automaton clock dating to the late 1400s.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

An art deco ice cream shop covered in vintage tiles.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."