The unbelievably opulent home built for an infamous newspaperman.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

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

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Pilgrimage site for star-crossed lovers.

A musical instrument played by the sea.

A world-class observatory in the California desert.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

Copenhagen's celebrated theme park and gardens.

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

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

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

San Diego's most historic and haunted home.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The hallucinogenic center of the ancient world.

Tiki luxury on Nob Hill.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A reproduction of earth's many biomes.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

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

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